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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ufba/585

Title: Test of Anderson-Stuart model in sodium silicate glasses and the general Arrhenian conductivity rule in wide composition range
Authors: Nascimento, Marcio Luis Ferreira
Nascimento, Eduardo do
Pontuschka, Walter Maigon
Matusuoka, Masao
Watanabe, Shigueo
Keywords: Vidro;Condutividade;Anderson-Stuart;Modelo
Issue Date: 1-Jan-2006
Abstract: We collected and analyzed literature data on ionic conductivity sigma and activation energy EA in the binary sodium silicate system in a wide composition range. The Anderson and Stuart model has been considered to describe the decreasing tendency of activation energy EA with alkali concentration in this system. In this analysis were considered experimental parameters, such as shear modulus G and relative dielectric permittivity e. A general conductivity rule is found in 194 of 205 glasses, when one plots log sigma vs. EA/kBT, where kB is the Boltzmann constant and T is the absolute temperature. This fact means that the arrhenian relation has universal uniqueness of form sigma=sigma(EA,T) in wide Na2O composition range. The results also show that there is strong correlation by more than 19 orders of magnitude on conductivity with EA/kBT. An explanation for this behavior links ionic conductivity and microscopic structure. The problem of phase separation in this system is also considered.
URI: http://www.repositorio.ufba.br/ri/handle/ufba/585
ISSN: 03666913
Appears in Collections:Artigos Publicados em Periódicos (PEI)

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