Electrical conductivity of silicate glasses with tetravalent cations substituting Si

Autor(es)

Braunger, M. L. ^[1] ; Escanhoela, C. A. ^[2] ; Fier, I. ^[3] ; Walmsley, L. ^[3] ; Ziemath, E. C. ^[3]

Afiliação do(s) autor(es)

^[1] UNESP, Dept & Fis Quim Biol, FCT, Presidente Prudente, SP - Brazil

^[2] Univ Sao Paulo, Sao Carlos, SP - Brazil

^[3] UNESP, Dept Fis, IGCE, Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Non-Crystalline Solids; v. 358, n. 21, p. 2855-2861, OCT 15 2012.
• Citações Web of Science: 19

Resumo

The effects of substituting Si by M4+ cations in soda-lime silica glasses were analyzed by impedance spectroscopy in the frequency range of 1 Hz-1 MHz. The glass composition was (mol%) 22Na(2)O center dot 8CaO center dot 65SiO(2)center dot 5MO(2), M = Si, Ti, Ge, Zr, Sn, and Ce. Although the Na+ concentration in the glasses is constant, the Zr-containing glass exhibits the highest dc conductivity and the lowest activation energy, while the Ce-containing glass exhibits the lowest conductivity. The activation energies obtained experimentally agree with those obtained by a theoretical equation proposed by Anderson and Stuart. The differences in electrical conductivity presented by the several M-containing glasses are attributed to the effect that the M4+ ion has on the mobility of the diffusing Na+ ion. (C) 2012 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/07238-4 - Condutividade elétrica e polarização térmica de vidros soda-cal-sílica contendo diferentes cátions tetravalentes
• Beneficiário: Carlos Augusto Escanhoela Júnior
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 08/07304-7 - Espectroscopia de Impedância em Vidros 22Na2O.8CaO.65SiO2.5MO2 (M = Si, Ti, Ge, Zr, Sn, Ce), sem e com Troca Iônica Ag+-Na+
• Beneficiário: Maria Luisa Braunger Fier
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 05/04397-6 - Dureza Vickers e tenacidade à fratura de vidros com composição 22Na2O.8CaO.5MO2.65SiO2 (M = Si, Ti, Ge, Zr, Sn, Ce)
• Beneficiário: Ervino Carlos Ziemath
• Modalidade de apoio: Auxílio à Pesquisa - Regular