Please use this identifier to cite or link to this item:
https://repositorio.ufba.br/handle/ufba/596
metadata.dc.type: | Artigo de Periódico Artigo de Periódico |
Title: | Test of Anderson-Stuart model and the 'universal' conductivity in rubidium and cesium silicate glasses |
Authors: | Nascimento, Marcio Luis Ferreira Watanabe, Shigueo |
metadata.dc.creator: | Nascimento, Marcio Luis Ferreira Watanabe, Shigueo |
Abstract: | An analysis and brief discussion of experimental ionic conductivity 6 and activation energy EA 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 EA with alkali concentration in both alkali-silica systems. In this analysis were considered experimental parameters, like shear modulus G and relative dielectric permittivity e. An "universal" finding is obtained using log sigma x E-A/k(B)T in 51 of 53 glasses considering both alkali systems, where EA is the activation energy for conduction, k(B) 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 a is governed mainly by EA. An explanation for this behavior links ionic conductivity and microscopic structure. |
Keywords: | Vidro Condutividade Modelo Anderson-Stuart |
URI: | http://www.repositorio.ufba.br/ri/handle/ufba/596 |
Issue Date: | Sep-2005 |
Appears in Collections: | Artigo Publicado em Periódico (PEI) |
Files in This Item:
File | Description | Size | Format | |
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UniversalRbCsSilicate-BJP35-Nascimento.pdf | 532,41 kB | Adobe PDF | View/Open |
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