Escola Politécnica >
Programa de Pós-Graduação em Engenharia Industrial (PEI) >
Artigos Publicados em Periódicos (PEI) >

Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ufba/590

Title: Universal curve of ionic conductivities in binary alkali germanate glasses
Authors: Nascimento, Marcio Luis Ferreira
Nascimento, Eduardo do
Watanabe, Shigueo
Keywords: Vidro;Condutividade;m;Anderson-Stuart
Issue Date: 1-Jan-2006
Abstract: An analysis and brief discussion of experimental ionic conductivity a in the binary alkali germanate system is presented, exemplified on 31 binary GeO2 glasses that span ionic conductivity by more than 17 orders of magnitude in a wide composition range. An 'universal' finding using modified Arrhenius plots log sigma or log sigma T versus E-A/k(B)T is obtained, where E-A is the activation enthalpy for conduction, k(B) the Boltzmann constant and T is the absolute temperature. For a given value of E-A/k(B)T, the difference between large to small values of or is only about one order of magnitude in 87% of the glass systems considered. The fact that a lies on these single 'universal' curves for so many ion-conducting binary germanate glasses means that or is governed mainly by EA while the pre-exponential factor sigma(0) varies around an average value approximate to 50 S cm(-1). The activation enthalpy composition dependence is explained concerning the Anderson-Stuart theory.
URI: http://www.repositorio.ufba.br/ri/handle/ufba/590
ISSN: 02540584
Appears in Collections:Artigos Publicados em Periódicos (PEI)

Files in This Item:

File Description SizeFormat
UniversalGermanate-MCP96-Nascimento.pdf305.45 kBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


    Universidade Federal da Bahia

Contate-nos. Saiba mais sobre o RI/UFBA