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We investigated the ac and dc conductivity in 50V2O5-(50 − x)P2O5-xA2O (A = Li, Na, K) glasses as a function of temperature. The measurements were carried out in the frequency range from 10−4 to 107 Hz. For all compositions, the dc conductivity decreased with the increasing alkali ion content. The decrease in conductivity was more pronounced for larger alkali ions. The ac conductivity exhibited a universal dynamic response: σac = Aωs(T). For glasses containing less than 10 mol% of alkaline ions, the exponent s(T) temperature dependence was typical as that for electronic conducting glasses and decreased from a value near to unity at a low temperature (153 K) to 0.5 at 423 K. A small variation only (from 0.99 to 0.95) of s(T) was observed in the mixed electronic-ionic regime. This behavior is known as nearly constant loss (NCL). We found that the NCL behavior could be observed in a very wide range of temperature and frequency in mixed electronic-ionic conducting glasses.
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- Kategoria:
- Publikacja w czasopiśmie
- Typ:
- artykuł w czasopiśmie wyróżnionym w JCR
- Opublikowano w:
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JOURNAL OF NON-CRYSTALLINE SOLIDS
nr 356,
ISSN: 0022-3093 - Język:
- angielski
- Rok wydania:
- 2010
- Opis bibliograficzny:
- Barczyński R., Król P., Murawski L.: Ac and dc conductivities in v2o5-p2o5 glasses containing alkaline ions// JOURNAL OF NON-CRYSTALLINE SOLIDS. -Vol. 356, nr. Iss. 37-40 (2010),
- Weryfikacja:
- Politechnika Gdańska
wyświetlono 88 razy