Origin of constant loss in ionic conductors
We have analyzed the constant loss contribution to the ac conductivity in the frequency range 10 Hz–1 MHz and temperatures down to 8 K, for two Li ionic conductors, one crystalline (Li_(0.18)La_(0.61)TiO_(3)) and the other glassy (61SiO_(2) . 35Li_(2)O . 3Al_(2)O_(3) . P_(2)O_85)). As temperature is...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2001 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/59639 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/59639 |
| Access Level: | acceso abierto |
| Palabra clave: | 537 Non-Arrhenius conductivity AC conductivity Nonlinear lattices Slow relaxation Oxide glasses Temperature Dynamics Spectra Melts Spectroscopy. Electricidad Electrónica (Física) 2202.03 Electricidad |
| Sumario: | We have analyzed the constant loss contribution to the ac conductivity in the frequency range 10 Hz–1 MHz and temperatures down to 8 K, for two Li ionic conductors, one crystalline (Li_(0.18)La_(0.61)TiO_(3)) and the other glassy (61SiO_(2) . 35Li_(2)O . 3Al_(2)O_(3) . P_(2)O_85)). As temperature is increased a crossover is observed from a nearly constant loss to a fractional power law frequency dependence of the ac conductivity. At any fixed frequency ω, this crossover occurs at a temperature T such that ω = v_(0) exp(-E_(m)/k_(B)T), where v_(0) is the attempt frequency and E_(m) is identified with the barrier for Li^(+) ions to leave their wells. |
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