Chemical capacitance proposed for manganite-based ceramics
The measured value of effective electric permittivity ϵeff of several compounds, e.g., (BiNa)(MnNb)O₃, (BiPb)(MnNb)O₃, and BiMnO₃ increases from a value ≅10÷100 at the low temperature range (100÷300 K) up to the high value reaching the value 10⁵ at high temperature range, e.g., 500÷800 K. Such featu...
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| Дата: | 2013 |
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| Формат: | Стаття |
| Мова: | English |
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Інститут фізики конденсованих систем НАН України
2013
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/120828 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Chemical capacitance proposed for manganite-based ceramics / A. Molak // Condensed Matter Physics. — 2013. — Т. 16, № 3. — С. 31801:1-10. — Бібліогр.: 20 назв. — англ. |
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irk-123456789-1208282017-06-14T03:04:13Z Chemical capacitance proposed for manganite-based ceramics Molak, A. The measured value of effective electric permittivity ϵeff of several compounds, e.g., (BiNa)(MnNb)O₃, (BiPb)(MnNb)O₃, and BiMnO₃ increases from a value ≅10÷100 at the low temperature range (100÷300 K) up to the high value reaching the value 10⁵ at high temperature range, e.g., 500÷800 K. Such features suggest the manifestation of thermally activated space charge carriers, which effect the measured capacitance. The measured high-value effective permittivity of several manganite compounds can be ascribed to the chemical capacitance Cμ=e² ∂Ni/∂μi expressed in terms of the chemical potential μ. The chemical capacitance Cμ(cb)=e² nC/kBT depends on temperature when the conduction electrons with density nC=NCexp(μn-EC)/kBT are considered. The experimental results obtained for the manganite compounds, at high temperature range, are discussed in the framework of the chemical capacitance model. However, the measured capacitance dependence on geometrical factors is analysed for BiMnO3 indicating that the non-homogeneous electrostatic capacitor model is valid in 300÷500 K range. Вимiряне значення ефективної електричної проникностi εeff декiлькох сполук, а саме, (BiNa)(MnNb)O₃, (BiPb)(MnNb)O₃, i BiMnO₃ збiльшилося iз значення ≈ 10÷100 в низькотемпературнiй областi (100÷300 K) до високого значення, досягаючи значення 10⁵ у високотемпературнiй областi, а саме, 500 ÷ 800 K. Такi риси є виявом термiчно активованих носiїв просторового заряду, якi впливають на вимiрювану ємнiсть. Вимiряне високе значення ефективної проникностi декiлькох магнiтних сполук може бути приписане хiмiчнiй ємностi Cµ = e²∂Ni /∂µi , вираженiй в термiнах хiмiчного потенцiалу µ. Хiмiчна ємнiсть C(cb) µ = e²nC/kBT залежить вiд температури, при якiй розглядаються електрони провiдностi з густиною nC = NC exp¡µn −EC¢/kBT. Експериментальнi результати, отриманi для сполук манганiту у високотемпературнiй областi, обговорюються в рамках моделi хiмiчної ємностi. Проте, вимiряна ємнiсна залежнiсть вiд геометричних факторiв, що аналiзується для BiMnO3, вказує, що неоднорiдна електростатична ємнiсна модель є справедливою в областi 300÷500 K. 2013 Article Chemical capacitance proposed for manganite-based ceramics / A. Molak // Condensed Matter Physics. — 2013. — Т. 16, № 3. — С. 31801:1-10. — Бібліогр.: 20 назв. — англ. 1607-324X PACS: 82.45.Un, 77.22.Ch DOI:10.5488/CMP.16.31801 arXiv:1309.6127 http://dspace.nbuv.gov.ua/handle/123456789/120828 en Condensed Matter Physics Інститут фізики конденсованих систем НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| description |
The measured value of effective electric permittivity ϵeff of several compounds, e.g., (BiNa)(MnNb)O₃, (BiPb)(MnNb)O₃, and BiMnO₃ increases from a value ≅10÷100 at the low temperature range (100÷300 K) up to the high value reaching the value 10⁵ at high temperature range, e.g., 500÷800 K. Such features suggest the manifestation of thermally activated space charge carriers, which effect the measured capacitance. The measured high-value effective permittivity of several manganite compounds can be ascribed to the chemical capacitance Cμ=e² ∂Ni/∂μi expressed in terms of the chemical potential μ. The chemical capacitance Cμ(cb)=e² nC/kBT depends on temperature when the conduction electrons with density nC=NCexp(μn-EC)/kBT are considered. The experimental results obtained for the manganite compounds, at high temperature range, are discussed in the framework of the chemical capacitance model. However, the measured capacitance dependence on geometrical factors is analysed for BiMnO3 indicating that the non-homogeneous electrostatic capacitor model is valid in 300÷500 K range. |
| format |
Article |
| author |
Molak, A. |
| spellingShingle |
Molak, A. Chemical capacitance proposed for manganite-based ceramics Condensed Matter Physics |
| author_facet |
Molak, A. |
| author_sort |
Molak, A. |
| title |
Chemical capacitance proposed for manganite-based ceramics |
| title_short |
Chemical capacitance proposed for manganite-based ceramics |
| title_full |
Chemical capacitance proposed for manganite-based ceramics |
| title_fullStr |
Chemical capacitance proposed for manganite-based ceramics |
| title_full_unstemmed |
Chemical capacitance proposed for manganite-based ceramics |
| title_sort |
chemical capacitance proposed for manganite-based ceramics |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2013 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/120828 |
| citation_txt |
Chemical capacitance proposed for manganite-based ceramics / A. Molak // Condensed Matter Physics. — 2013. — Т. 16, № 3. — С. 31801:1-10. — Бібліогр.: 20 назв. — англ. |
| series |
Condensed Matter Physics |
| work_keys_str_mv |
AT molaka chemicalcapacitanceproposedformanganitebasedceramics |
| first_indexed |
2023-10-18T20:38:14Z |
| last_indexed |
2023-10-18T20:38:14Z |
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1796150717066510336 |