| Texto completo | |
| Autor(es): |
Esquina Tsuchida, Jefferson
;
Aparecido Ferri, Fabio
;
Sergio Pizani, Paulo
;
Martins Rodrigues, Ana Candida
;
Kundu, Swarup
;
Fabian Schneider, Jose
;
Dutra Zanotto, Edgar
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Chemistry Chemical Physics; v. 19, n. 9, p. 6594-6600, MAR 7 2017. |
| Citações Web of Science: | 3 |
| Resumo | |
In this work, mixed alkali metaphosphate glasses based on K-Na, Rb-Na, Rb-Li, Cs-Na and Cs-Li combinations were studied by differential scanning calorimetry (DSC), complex impedance spectroscopy, and Raman spectroscopy. DSC analyses show that both the glass transition (T-g) and melting temperatures (T-m) exhibit a clear mixed-ion effect. The ionic conductivity shows a strong mixed-ion effect and decreases by more than six orders of magnitude at room temperature for Rb-Na or Cs-Li alkali pairs. This study confirms that the mixed-ion effect may be explained as a natural consequence of random ion mixing because ion transport is favoured between well-matched energy sites and is impeded due to the structural mismatch between neighbouring sites for dissimilar ions. (AU) | |
| Processo FAPESP: | 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 12/24802-6 - Estrutura e mecanismos de nucleação em vidros óxidos: Abordagem utilizando Ressonância Magnética Nuclear |
| Beneficiário: | Jefferson Esquina Tsuchida |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |