Test of Anderson-Stuart model and the "universal" conductivity in rubidium and cesium silicate glasses
AUTOR(ES)
Nascimento, Marcio Luis Ferreira, Nascimento, Eduardo do, Watanabe, Shigueo
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2005-09
RESUMO
An analysis and brief discussion of experimental ionic conductivity sigma and activation energy E A in the binary rubidium and cesium silicate systems is presented, exemplified on 23 and 30 glasses respectively, in a wide composition range (5-45 Rb2O and Cs2O mole%). The Anderson and Stuart model has been considered to describe the variation of activation energy E A with alkali concentration in both alkali-silica systems. In this analysis were considered experimental parameters, like shear modulus G and relative dielectric permittivity epsilon. An "universal" finding is obtained using logsigma× E A/kB T in 51 of 53 glasses considering both alkali systems, where E A is the activation energy for conduction, kB is the Boltzmann constant and T is the absolute temperature. This strong correlation by more than 13 (Rb-based glasses) and 15 (Cs-based glasses) orders of magnitude means that sigma is governed mainly by E A. An explanation for this behavior links ionic conductivity and microscopic structure.
Documentos Relacionados
- Correlation between conductivity and free volume in rubidium and cesium silicate glasses
- Teste do modelo de Anderson-Stuart em vidros silicatos de sódio e a regra geral da condutividade de Arrhenius numa ampla faixa de composições
- ACID EXCRETION IN RUBIDIUM- AND CESIUM-SUBSTITUTED RATS*†
- Accumulation of Potassium, Cesium, and Rubidium in Bean Plants Grown in Nutrient Solutions 12
- IONIC REQUIREMENTS OF TREPONEMA PALLIDUM II. : Ammonium, Lithium, Rubidium, and Cesium