Synthesis and characterisation of new potassium-containing argyrodite-type compounds
Potassium halogen thiophosphates K₆PS₅Br and K₆PS₅Cl, as well as halogen-free K₇PS₆ compound, were synthesized using the two-step technique from elemental substances as well as potassium halides. The elemental composition of the obtained samples was determined using energy-dispersive X-ray spectrosc...
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| Опубліковано в: : | Semiconductor Physics Quantum Electronics & Optoelectronics |
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Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України
2019
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Synthesis and characterisation of new potassium-containing argyrodite-type compounds / I.P. Studenyak, A.I. Pogodin, V.I. Studenyak, O.P. Kokhan, Yu.M. Azhniuk, C. Cserhati, S. Kokenyesi, D. R.T. Zahn // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2019. — Т. 22, № 1. — С. 26-33. — Бібліогр.: 26 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860479899270119424 |
|---|---|
| author | Studenyak, I.P. Pogodin, A.I. Studenyak, V.I. Kokhan, O.P. Azhniuk, Yu.M. Cserhati, C. Kokenyesi, S. Zahn, D. R.T. |
| author_facet | Studenyak, I.P. Pogodin, A.I. Studenyak, V.I. Kokhan, O.P. Azhniuk, Yu.M. Cserhati, C. Kokenyesi, S. Zahn, D. R.T. |
| citation_txt | Synthesis and characterisation of new potassium-containing argyrodite-type compounds / I.P. Studenyak, A.I. Pogodin, V.I. Studenyak, O.P. Kokhan, Yu.M. Azhniuk, C. Cserhati, S. Kokenyesi, D. R.T. Zahn // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2019. — Т. 22, № 1. — С. 26-33. — Бібліогр.: 26 назв. — англ. |
| collection | DSpace DC |
| container_title | Semiconductor Physics Quantum Electronics & Optoelectronics |
| description | Potassium halogen thiophosphates K₆PS₅Br and K₆PS₅Cl, as well as halogen-free K₇PS₆ compound, were synthesized using the two-step technique from elemental substances as well as potassium halides. The elemental composition of the obtained samples was determined using energy-dispersive X-ray spectroscopy. Raman spectra of K₆PS₅Br and K₆PS₅Cl show themselves to be very similar to those of chemically related Cu₆PS₅Br and Cu₆PS₅Cl argyrodite crystals. The much richer spectra of K₆PS₅Br and K₆PS₅Cl, as well as K₇PS₆, however, reveal that their structure most likely differs from the cubic structure of Cu₆PS₅Br and Cu₆PS₅Cl argyrodites.
|
| first_indexed | 2026-03-23T18:51:36Z |
| format | Article |
| fulltext |
ISSN 1560-8034, 1605-6582 (On-line), SPQEO, 2019. V. 22, N 1. P. 26-33.
© 2019, V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine
26
Semiconductor physics
Synthesis and characterization of new potassium-containing
argyrodite-type compounds
I.P. Studenyak1, A.I. Pogodin1, V.I. Studenyak1, O.P. Kokhan1, Yu.M. Azhniuk1,2, C. Cserháti3, S. Kökényesi3,
D.R.T. Zahn4
1
Uzhhorod National University, Faculty of Physics
3, Narodna Sq., 88000 Uzhhorod, Ukraine
2
Institute of Electron Physics, National Academy of Sciences of Ukraine, Uzhhorod, Ukraine
3
Department of Experimental Physics, Faculty of Science and Technology, University of Debrecen,
18/a Bem Sq., 4026 Debrecen, Hungary,
4
Semiconductor Physics, Chemnitz University of Technology,
D-09107 Chemnitz, Germany
E-mail: studenyak@dr.com
Abstract. Potassium halogenthiophosphates K6PS5Br and K6PS5Cl as well as halogen-free
K7PS6 compound were synthesized using the two-step technique from elemental substances
as well as potassium halides. The elemental composition of the obtained samples was
determined using energy-dispersive X-ray spectroscopy. Raman spectra of K6PS5Br and
K6PS5Cl show themselves to be much similar to those of chemically related Cu6PS5Br and
Cu6PS5Cl argyrodite crystals. The much richer spectra of K6PS5Br and K6PS5Cl as well as
K7PS6, however, reveal that their structure most likely differs from the cubic structure of
Cu6PS5Br and Cu6PS5Cl argyrodites.
doi: https://doi.org/10.15407/spqeo22.01.26
PACS 78.40.Ha; 77.80.Bh
Keywords: argyrodite, synthesis, scanning electron microscopy, Raman spectroscopy.
Manuscript received 28.12.18; revised version received 23.01.19; accepted for publication
20.02.19; published online 30.03.19.
1. Introduction
The family of argyrodite-structure compounds (the name
originates from the argyrodite Ag8GeS6 mineral) includes
a great number of representatives with a common
chemical formula −−
−
++
−−
12
6
1
/)12( YXBA x
nm
mxn (0 < x < 1),
where m and n are the valences of cations A = (Cu+, Ag+,
Cd2+, Hg2+) and B = (Ga3+, Si4+, Ge4+, P5+, As5+),
respectively, with X = (S2–, Se2–, Te2–) and Y = (Cl–, Br–,
I–) anions [1]. Some of them are known as superionic
conductors promising for applications as solid
electrolytes, supercapacitors, ion-selective membranes,
and other electrochemical devices [2]. They are
characterized by high electrical conductivity comparable
to that of the best superionic conductors [3]. The most
extensively studied are copper- and silver-containing
argyrodites that were the subject of numerous studies
(e.g. [4–8]). They are obtained in single-crystal, poly-
and nanocrystalline forms, as composites, ceramics, and
thin films [8–14]. For these materials, detailed structural,
electrical, and optical studies were carried out,
order/disorder processes and ion transport mechanisms
were studied.
It was shown that structural disorder in the
superionic phase of argyrodite crystals consists of two
components – static and dynamic [8]. The former is
related to the structure deficiency and leads to local non-
uniform electric fields, which, in turn, result in additional
smearing of band edges. Dynamic structural disorder
appears in the superionic phase as hopping motion of
mobile copper ions leading to high ionic conductivity. In
the optical spectra, this disorder is revealed as the Urbach
behaviour of the absorption edge in the superionic phase
[5–8]. The electrical conductivity of copper-containing
Cu6PS5I, Cu6PS5Br and Cu6PS5Cl argyrodites at 300 K
and 1 kHz is 1.3×10–1 S/m, 1.2×10–3 S/m and 4.3 S/m,
respectively [15].
For practical purposes, most suitable are argyrodite
materials in the form of composites, ceramics, or thin
films. For Cu6PS5I-based composites with polyvinyl-
acetate, the electric conductivity is 7.2×10–2 S/m at
106 Hz [10], while for the composites of Cu6PS5I
nanoparticles in a 6CB liquid crystal it increases to
4.8×10–6 S/m at 106 Hz [12]. For Cu6PS5I-based ceramics
the total electrical conductivity increases with the grain
size decrease: for the average grain size of 24 nm it
SPQEO, 2019. V. 22, N 1. P. 26-33.
Studenyak I.P., Pogodin A.I., Studenyak V.I. et al. Synthesis and characterization of new potassium-containing …
27
reaches 5.6×10–1 S/m at 106 Hz, a value typical for
single-crystal Cu6PS5I [13]. Cu6PS5I-based thin films
deposited by non-reactive radio-frequency magnetron
sputtering are also characterized by the high electrical
conductivity 5.2×10–2 S/m at 106 Hz [14].
In the recent decade, lithium-containing Li6PS5X
(with X = Cl, Br and I) argyrodite superionic conduc-
tors have been actively studied as promising
materials for all-solid-state batteries (ASSBs) [16–19].
It was demonstrated that ASSBs with oxygen-doped
Li6PS5-xOxBr (0 ≤ x ≤ 1) superionic conductors can
achieve higher capacities than oxygen-free superionic
materials [20].
Even though the lithium-containing superionic
conductors are very promising, the search for new
superionic materials, in particular the sodium- or
potassium-containing ones, is currently of great
importance. This work is aimed at the synthesis and
characterization of new potassium-containing argyrodite
compounds which, to our knowledge, have not been
reported so far.
2. Experimental
Potassium halogenthiophosphates K6PS5Cl and K6PS5Br
were synthesized from high-purity elemental
components: potassium 99.9 %, sulphur extra pure 15-3,
phosphorus 99.9994% as well as chemically pure
potassium chloride (bromide), additionally refined by
directed crystallization from the melt. The two-
temperature synthesis method was employed:
stoichiometric amounts of the initial substances were
loaded in a modified 140–160 mm long silica ampoule
with the diameter 30…32 mm, which had an internal 80–
100 mm long silica container with the diameter
18…20 mm. Potassium, phosphorus, and potassium
chloride (bromide) were loaded in the internal container,
while sulphur was loaded in the outer ampoule. The
ampoules were pumped out to a residual pressure of
0.13 Pa and sealed before the synthesis.
The specially designed container with the loaded
components was placed in a two-zone vertical resistive
oven with electronically controlled temperatures. The
apparatus design is shown in Fig. 1.
The synthesis of K6PS5Cl and K6PS5Br was
performed by stepwise temperature increase with aging at
523 K for full fixation of sulphur and phosphorus. Under
these conditions, potassium does not react with the
container material, while the interaction with the sulphur
vapour is slow, without intense heat liberation. Further
heating was carried out at the rate 50 K/h up to the
maximal temperature of 1100 K (K6PS5Cl) or 1060 K
(K6PS5Br), which was by 50 K above the melting point
for the binary compounds KCl and KBr, respectively. At
this temperature, the melt was aged for 24 h with
subsequent cooling down to 773…853 K (by 30 to 50 K
above the crystallization point) with 24-h aging and
further cooling down to the room temperature at a rate of
50 K/h. The synthesis resulted in visually polycrystal-like
or glass-like materials of white or light yellow colour.
Fig. 1. Apparatus for potassium halogenthiophosphate
synthesis.
The specimens obtained did not stick to the silica
container or interact with its material.
Differential thermal analysis of the obtained
samples was performed using combined chromel–alumel
thermocouples at heating/cooling rates of 700 K/h. The
accuracy of the temperature measurements was ±5 K.
Scanning electron microscopy (SEM) studies of the
compounds were performed using the Hitachi S-4300
microscope. SEM studies were combined with energy-
dispersive X-ray spectroscopy (EDX) to determine the
chemical composition of the compounds.
Raman scattering measurements were carried out at
room temperature using the Horiba LabRAM 800
spectrometer. Excitation was provided by a Cobolt
Fandango solid-state laser with the excitation wavelength
514.7 nm. The signal was detected by a cooled CCD
camera. The instrumental resolution was better than
2.5 cm–1.
3. Results and discussion
The synthesized materials were studied by differential
thermal analysis (see Fig. 2). The DTA curve for K7PS6
(Fig. 2a) does not exhibit noticeable anomalies in the
heating or cooling curves. A slight endothermic effect of
softening is observed in the heating curve at 607±5 K as
well as a smeared exothermic effect of crystallization at
628±5 K, no exothermic effect of K7PS6 melting could be
detected. Meanwhile, a slight exothermic effect of
crystallization is observed at 687±5 K.
The K6PS5Cl DTA curve (Fig. 2b) is characterized
by the presence of two endothermic effects at 735±5 K
and 800±5 K in the heating curve and an exothermic
effect in the cooling curve. The endothermic effect at
735±5 K is rather smeared, which can be an evidence for
softening of a glassy phase within the range 735…782 K.
Simultaneously, no clear exothermic effect of glass
crystallization is observed. The endothermic effect at
SPQEO, 2019. V. 22, N 1. P. 26-33.
Studenyak I.P., Pogodin A.I., Studenyak V.I. et al. Synthesis and characterization of new potassium-containing …
28
Fig. 2. DTA curves for the synthesized K7PS6, K6PS5Cl, and
K6PS5Br samples.
800±5 K corresponds to K6PS5Cl melting. The cooling
curve reveals a smeared exothermic effect of
crystallization at the temperature 694±5 K. This
difference between the temperatures of the corresponding
effects in the heating and cooling curves can possibly be
an evidence for a tendency to glass formation.
The DTA curve for K6PS5Br (Fig. 2c) exhibits two
endothermic effects at 699±5 K and 746±5 K. Both
effects are relatively slight and can be related to melting
of a crystalline phase. Similarly to K6PS5Cl, the
endothermic effect at 746±5 K corresponds to the
K6PS5Br melting, while the first endothermic effect
within the 699…735 K range is smeared and seems to be
more typical for softening of a glassy phase.
SEM images of the synthesized potassium
halogenthiophosphates shown in Fig. 3 reveal a visually
polycrystal-like pattern with defined irregular domains of
20 to 200 µm size. The surface of the synthesized K7PS6
sample is much smoother (Fig. 4). EDX studies of the
samples showed the chemical composition of the
compounds to differ from the stoichiometry by
no more than 10 % (e.g., K6.1±0.1P1.1±0.1S4.9±0.1Cl0.9±0.1,
K7.2±0.1P1.0±0.1S5.8±0.1).
Raman spectra of the synthesized K6PS5Br and
K6PS5Cl compounds are presented in Fig. 5. The spectra
contain a set of quite narrow peaks, clearly revealing the
crystalline character of the samples. The spectra show a
noticeable similarity, with a dominating narrow (FWHM
below 3 cm–1) peak near 420 cm–1. Comparison of the
measured spectra with those of relatively well studied
Cu6PS5Br and Cu6PS5Cl crystals with argyrodite
structure [15, 21–23] grown by similar technique reveals
similar features. Our experimentally measured Raman
spectra of Cu6PS5Br and Cu6PS5Cl crystals were
basically the same as those studied earlier [15]. For the
copper-containing argyrodite crystals, the dominating
peak near 420 cm–1 is assigned to symmetric vibrations
of the PS4 tetrahedra, which are the main structural units
in the argyrodite lattice [15, 21-23]. The similar positions
and intensities of this dominating narrow feature in the
spectra make it reasonable to assume that the synthesized
K6PS5Br and K6PS5Cl compounds are, similarly to
Cu6PS5Br and Cu6PS5Cl, characterized by the argyrodite
structure.
However, a more detailed look at the dominating
peak (Fig. 6) shows that the spectra of K6PS5Br and
Fig. 3. SEM images of K6PS5Br (a) and K6PS5Cl (b) surfaces.
SPQEO, 2019. V. 22, N 1. P. 26-33.
Studenyak I.P., Pogodin A.I., Studenyak V.I. et al. Synthesis and characterization of new potassium-containing …
29
Fig. 4. SEM image of K7PS6 sample surface.
K6PS5Cl reveal distinct differences from those of the
copper-containing argyrodites measured under the same
experimental conditions. The most intense sharp peak in
the spectra of Cu6PS5Br (418 cm–1) and Cu6PS5Cl
(421 cm–1) is well described by a Lorentzian with
FWHM of 9…11 cm–1, which is very similar to the
earlier data [15, 21, 23]. Meanwhile, the similar peak for
K6PS5Br and K6PS5Cl is much narrower with a clearly
visible shoulder at the lower-frequency side. Simulation
of the observed feature by two Lorentzians reveals a
superposition of two narrow peaks differing in frequency
by 3 cm–1 (Fig. 6).
In general, the room-temperature Raman spectra of
K6PS5Br and K6PS5Cl are much richer than those of the
copper-containing counterparts. Namely, instead of a
relatively weak and broad band near 540 cm–1, which for
Cu6PS5Br and Cu6PS5Cl is assigned to internal stretching
vibrations of the PS4 tetrahedra [15], for potassium
halogenthiophosphates a series of narrow peaks within
the range 530…575 cm–1 is observed. Note that for
copper-containing argyrodites splitting of the broad band
into several features is revealed at low temperatures [15].
In the lower-frequency range (below 400 cm–1),
there is no visible correlation between the room-
temperature Raman spectra of copper and potassium
halogenthiophosphates. The spectra of K6PS5Br and
K6PS5Cl contain much more peaks that are considerably
narrower than those of the copper-containing
counterparts. A doublet observed for potassium-
containing argyrodites within the range 267…274 cm–1 is
most likely related to bending vibrations of the PS4
tetrahedral groups. Their counterparts in Cu6PS5Br and
Cu6PS5Cl spectra are relatively broad features near
310 cm–1 corresponding to doubly and triply degenerate
E and F2 bands which are known to be resolved at lower
temperatures [15]. A somewhat broader (16–18 cm–1)
feature near 210 cm–1 in the spectra of K6PS5Br and
K6PS5Cl does not have a direct counterpart in the room-
temperature Raman spectra of Cu6PS5Br and Cu6PS5Cl,
but most likely corresponds to the vibrations reported for
copper-containing argyrodites at 77 K within the range
220…230 cm–1. Weak features observed at 85 and
98 cm–1 (for both K6PS5Br and K6PS5Cl) as well as 124
and 143 cm–1 (for K6PS5Cl only) can be assigned to
external translational and librational vibrations with the
participation of sulphur, potassium, and halogen atoms.
Two groups of Raman features reveal the most
noticeable difference between the potassium-containing
and copper-containing halogenthiophosphates as well as
between K6PS5Br and K6PS5Cl. While for Cu6PS5Br and
Cu6PS5Cl no features are observed in the high-frequency
region between the most intense peak near 420 cm–1 and
the low-intensity maximum near 540 cm–1 even at low
temperatures, for K6PS5Br one can clearly observe a
maximum at 465 cm–1 while for K6PS5Cl an intense
rather sharp doublet is revealed at 446 and 451 cm–1 as
well as a weaker shoulder at 463 cm–1. At somewhat
lower frequencies, a weak band is observed at 361 cm–1
for K6PS5Br and a roughly equally weak triplet within the
range 336…346 cm–1 is registered for K6PS5Cl, with no
counterparts in the spectra of the copper-containing
argyrodites.
In spite of the observed differences, one can
assume, based on the general similarity of the Raman
spectra of the synthesized K6PS5Br and K6PS5Cl
and the known Cu6PS5Br and Cu6PS5Cl crystals,
that all these materials belong to the argyrodite family
with pronounced PS4 tetrahedral structural groups. Still,
Fig. 5. Raman spectra of K6PS5Br and K6PS5Cl crystals.
SPQEO, 2019. V. 22, N 1. P. 26-33.
Studenyak I.P., Pogodin A.I., Studenyak V.I. et al. Synthesis and characterization of new potassium-containing …
30
there are some rather systematic differences in the
Raman spectra of K6PS5Br and K6PS5Cl, on the one
hand, and Cu6PS5Br and Cu6PS5Cl, on the other hand
which can be explained by several factors. First of all, the
broader spectral features of copper-containing argyrodite
crystals in comparison with those of K6PS5Br and
K6PS5Cl can be related to the lower rigidity of the
Cu6PS5Br and Cu6PS5Cl crystal lattice since these
materials are known to possess high ionic conductivity at
room temperature [1, 9]. Even though the ionic
conductivity is related to mobile copper ions, the
vibrations of which have lower frequencies and are
external with respect to the pronounced PS4 tetrahedral
structural groups, the ionic motion evidently contributes
to the increase of the damping of their vibrations
revealed as somewhat broader peaks in the Cu6PS5Br and
Cu6PS5Cl Raman spectra. The high ionic mobility in
copper-containing argyrodites can also be responsible for
the fact that broad maxima in the room-temperature
Raman spectra of these compounds can be split into
narrower features only at lower temperatures [15].
The appearance of multiple narrow peaks in the
higher-frequency range of the K6PS5Br and K6PS5Cl
Raman spectra (four distinct features within the
530…575 cm–1 range, the intense new peaks within the
445…465 cm–1 range, and the clearly resolved doublet
structure of the most intense peak), as compared to those
of the copper-containing argyrodites, can be evidence for
a difference in the crystal structure of potassium-
containing compounds. It is well known that crystals of
the argyrodite family can possess not only cubic (like
Cu6PS5Br and Cu6PS5Cl), but also hexagonal [24],
orthorhombic [25], or monoclinic [26] structure. A non-
cubic argyrodite structure of potassium halogen-
thiophosphates could be a possible reason for splitting of
the modes at 267 and 273 cm–1, which correlate with
degenerate vibrations of E and F2 symmetry near
310 cm–1 in Cu6PS5Br and Cu6PS5Cl.
Alternatively, the numerous distinct features in the
Raman spectra of the synthesized K6PS5Br and K6PS5Cl
compounds can possibly be related to the presence of
different crystalline polythiophosphate species, the
structure of which can contain tetrahedra of similar type,
with or without distortion, providing the corresponding
different vibration frequencies being revealed. It is
known from our recent studies [22, 23] that, for instance,
Cu7PS6, although possessing a different symmetry group,
has a very similar most prominent Raman feature at
425 cm–1, corresponding to symmetric vibrations of the
PS4 tetrahedra. From this point of view, it seemed
interesting to compare these data with those of Raman
measurements performed for the synthesized halogen-
free K7PS6 compound. From the corresponding spectra,
shown in Fig. 7, one can clearly see that the similarity
between K7PS6 and Cu7PS6 is much smaller than the
similarity between K7PS6 and the potassium-containing
halogenthiophosphates. In particular, one can clearly
notice the agreement of the peak frequencies at 445 and
Fig. 6. Zoomed view of the dominating feature in the Raman spectra of Cu6PS5Br and K6PS5Br (a) as well as Cu6PS5Cl and
K6PS5Cl (b) crystals. The observed peak is approximated by one (where appropriate) or two Lorentzians. The frequencies and
halfwidths (in parentheses) of the fitting contours are indicated.
SPQEO, 2019. V. 22, N 1. P. 26-33.
Studenyak I.P., Pogodin A.I., Studenyak V.I. et al. Synthesis and characterization of new potassium-containing …
31
Fig. 7. Comparison of the Raman spectra of K7PS6 and Cu7PS6
compounds.
467 cm–1 in the spectrum of K7PS6 (Fig. 7) with those
observed for K6PS5Br and K6PS5Cl (Fig. 5). On the one
hand, as noted above, this could possibly mean that the
synthesized potassium halogenthiophosphate compounds
may have some K7PS6 crystallites that thus leave their
fingerprints in the Raman spectra. However, it seems
much more realistic that the structure of the argyrodite
compounds under investigation depends on the cation
species much stronger as it could be initially expected.
4. Conclusions
Potassium halogenthiophosphates K6PS5Br and K6PS5Cl
as well as halogen-free K7PS6 compound, which, to our
knowledge, have not been reported before, were
synthesized by a two-step technique from elemental
substances as well as potassium halides. The elemental
composition of the samples was determined by EDX.
Raman spectra of K6PS5Br and K6PS5Cl samples provide
evidence for their crystalline structure. Their comparison
with the Raman spectra of chemically related Cu6PS5Br
and Cu6PS5Cl argyrodites confirmed that K6PS5Br and
K6PS5Cl also belong to the argyrodite family. However,
the much richer spectrum of K6PS5Br and K6PS5Cl as
well as K7PS6 in comparison with the copper-containing
related compounds implies that the structure of
potassium-containing argyrodites most likely differs
from the cubic structure of Cu6PS5Br and Cu6PS5Cl
argyrodites.
Acknowledgement
Yu.M. Azhniuk is grateful to DFG Research Unit FOR
1154 “Towards Molecular Spintronics” for the financial
support of his research at Chemnitz University of
Technology.
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Studenyak I.P., Pogodin A.I., Studenyak V.I. et al. Synthesis and characterization of new potassium-containing …
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Authors and CV
Ihor P. Studenyak, born in 1960,
defended his Dr. Sc. degree in Physics
and Mathematics in 2003 and became
full professor in 2004. Vice-rector for
research at Uzhhorod National
University, Ukraine. Authored over
200 publications, 120 patents, 15
textbooks. The area of his scientific
interests includes physical properties of semiconductors,
ferroics and superionic conductors.
Artem I. Pogodin, born in 1988,
defended his PhD thesis in inorganic
chemistry in 2016. Senior researcher
at Uzhhorod National University.
Authored over 35 articles and 25
patents. The area of his scientific
interests includes solid state
chemistry, crystal growth, and
materials science.
Viktor I. Studenyak, born in 1997.
At present he is a master student at
Faculty of Physics, Uzhhorod
National University. Authored 7
articles and 5 patents. The area of his
scientific interests includes optical
properties of superionic conductors.
Oleksandr P. Kokhan, born in 1958,
defended his PhD thesis in inorganic
chemistry in 1996 and became docent
in 2002. Associate professor of
Inorganic Chemistry department at
Uzhhorod National University.
Authored over 80 articles and 40
patents. The area of his scientific
interests includes inorganic chemistry, solid state
chemistry, crystal growth, materials science.
SPQEO, 2019. V. 22, N 1. P. 26-33.
Studenyak I.P., Pogodin A.I., Studenyak V.I. et al. Synthesis and characterization of new potassium-containing …
33
Yuriy M. Azhniuk, born in 1961,
accomplished his Dr. Sc. (equiv. to
Hab. Dr.) degree in Semiconductor
Physics in 2011. Senior Researcher at
Institute of Electron Physics, NAS of
Ukraine and Uzhhorod National Uni-
versity, Ukraine. Authored over 80
papers. The area of his scientific
interests includes semiconductor
physics, nanophysics, and Raman
spectroscopy.
Csaba Cserháti, born in 1963,
defended his PhD degree in Physics
in 1995. He is an associate professor
in University of Debrecen, Hungary.
Authored over 100 publications. The
area of his scientific interests is
materials science.
Sandor Kökényesi, born in 1946,
defended his PhD Dissertation in
Physics and Mathematics in 1973,
became DSc in 1990 and full professor
in 1991. Head of Department at
Uzhhorod National University till
2000, later up to now Scientific
Advisor, Emeritus at the University
of Debrecen, Hungary. Authored over 200 scientific
publications, 20 patents. The area of scientific interests
relates materials science, photonics, nanotechnology.
Dietrich R.T. Zahn, accomplished his
Ph. D. degree in 1988 at University of
Wales, Cardiff, UK. Professor of
Semiconductor Physics at Chemnitz
University of Technology, Chemnitz,
Germany since 1993. Council Member
of the German Physical Society
(DPG), Member of the EPSRC Peer
Review College, Vice-President of the German Vacuum
Society (DVG). Authored over 650 papers in peer-
reviewed journals. The area of his scientific expertise
includes semiconductor physics, nanophysics, physics of
surfaces and interfaces.
|
| id | nasplib_isofts_kiev_ua-123456789-215431 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1560-8034 |
| language | English |
| last_indexed | 2026-03-23T18:51:36Z |
| publishDate | 2019 |
| publisher | Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України |
| record_format | dspace |
| spelling | Studenyak, I.P. Pogodin, A.I. Studenyak, V.I. Kokhan, O.P. Azhniuk, Yu.M. Cserhati, C. Kokenyesi, S. Zahn, D. R.T. 2026-03-16T11:01:17Z 2019 Synthesis and characterisation of new potassium-containing argyrodite-type compounds / I.P. Studenyak, A.I. Pogodin, V.I. Studenyak, O.P. Kokhan, Yu.M. Azhniuk, C. Cserhati, S. Kokenyesi, D. R.T. Zahn // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2019. — Т. 22, № 1. — С. 26-33. — Бібліогр.: 26 назв. — англ. 1560-8034 PACS: 78.40.Ha; 77.80.Bh https://nasplib.isofts.kiev.ua/handle/123456789/215431 https://doi.org/10.15407/spqeo22.01.26 Potassium halogen thiophosphates K₆PS₅Br and K₆PS₅Cl, as well as halogen-free K₇PS₆ compound, were synthesized using the two-step technique from elemental substances as well as potassium halides. The elemental composition of the obtained samples was determined using energy-dispersive X-ray spectroscopy. Raman spectra of K₆PS₅Br and K₆PS₅Cl show themselves to be very similar to those of chemically related Cu₆PS₅Br and Cu₆PS₅Cl argyrodite crystals. The much richer spectra of K₆PS₅Br and K₆PS₅Cl, as well as K₇PS₆, however, reveal that their structure most likely differs from the cubic structure of Cu₆PS₅Br and Cu₆PS₅Cl argyrodites. Yu.M. Azhniuk is grateful to DFG Research Unit FOR 1154 “Towards Molecular Spintronics” for the financial support of his research at Chemnitz University of Technology. en Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України Semiconductor Physics Quantum Electronics & Optoelectronics Semiconductor physics Synthesis and characterisation of new potassium-containing argyrodite-type compounds Article published earlier |
| spellingShingle | Synthesis and characterisation of new potassium-containing argyrodite-type compounds Studenyak, I.P. Pogodin, A.I. Studenyak, V.I. Kokhan, O.P. Azhniuk, Yu.M. Cserhati, C. Kokenyesi, S. Zahn, D. R.T. Semiconductor physics |
| title | Synthesis and characterisation of new potassium-containing argyrodite-type compounds |
| title_full | Synthesis and characterisation of new potassium-containing argyrodite-type compounds |
| title_fullStr | Synthesis and characterisation of new potassium-containing argyrodite-type compounds |
| title_full_unstemmed | Synthesis and characterisation of new potassium-containing argyrodite-type compounds |
| title_short | Synthesis and characterisation of new potassium-containing argyrodite-type compounds |
| title_sort | synthesis and characterisation of new potassium-containing argyrodite-type compounds |
| topic | Semiconductor physics |
| topic_facet | Semiconductor physics |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/215431 |
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