Positron annihilation characterization of free volume in micro- and macro-modified Cu₀.₄Co₀.₄Ni₀.₄Mn₁.₈O₄ ceramics

• Published in: Физика низких температур
• Date: 2016
• Main Authors: Klym, H., Ingram, A., Shpotyuk, O., Hadzaman, I., Solntsev, V., Hotra, O., Popov, A.I.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2016
• Subjects: Low-Temperature Radiation Effects in Wide Gap Materials
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/129199
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Positron annihilation characterization of free volume in micro- and macro-modified Cu₀.₄Co₀.₄Ni₀.₄Mn₁.₈O₄ ceramics / H. Klym, A. Ingram, O. Shpotyuk, I. Hadzaman, V. Solntsev, O. Hotra, A.I. Popov // Физика низких температур. — 2016. — Т. 42, № 7. — С. 764-769. — Бібліогр.: 52 назв. — англ.

Free volume and pore size distribution size in functional micro and macro-micro-modified Cu₀.₄Co₀.₄Ni₀.₄Mn₁.₈O₄ ceramics are characterized by positron annihilation lifetime spectroscopy in comparison with Hg-porosimetry and scanning electron microscopy technique. Positron annihilation results are interpreted in terms of model implication positron trapping and ortho-positronium decaying. It is shown that free volume of positron traps are the same type for macro and micro modified Cu₀.₄Co₀.₄Ni₀.₄Mn₁.₈O₄ ceramics. Classic Tao-Eldrup model in spherical approximation is used to calculation of the size of nanopores smaller than 2 nm using the ortho-positronium lifetime.