| Texto completo | |
| Autor(es): |
Molla, Atiar R.
;
Rodrigues, Alisson M.
;
Singh, Shiv Prakash
;
Lancelotti, Ricardo Felipe
;
Zanotto, Edgar D.
;
Rodrigues, Ana C. M.
;
Dousti, Mohammad Reza
;
de Camargo, Andrea S. S.
;
Magon, Claudio Jose
;
Almeida Silva, Igor D'Anciaes
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of the American Ceramic Society; v. 100, n. 5, p. 1963-1975, MAY 2017. |
| Citações Web of Science: | 9 |
| Resumo | |
This paper describes the preparation of a transparent glass-ceramic from the SiO2-K2O-ZnO-Al2O3-TiO2 system containing a single crystalline phase, gahnite (ZnAl2O4). TiO2 was used as a nucleating agent for the heat-induced precipitation of gahnite crystals of 5-10 nm. The evolution of the ZnAl2O4 spinel structure through the gradual formation of Al-O bonds was examined by infrared spectroscopy. The dark brown color of the transparent precursor glass and glass-ceramic was eliminated using CeO2. The increase in transparency of the CeO2-doped glass and glass-ceramics was demonstrated by UV-visible absorption spectroscopy. EPR measurements confirmed the presence of Ce3+ ions, indicating that CeO2 was effective in eliminating the brown color introduced by Ti3+ ions via oxidation to Ti+4. The hardness of the glass-ceramic was 30% higher than that of the as-prepared glasses. This work offers key guidelines to produce hard, transparent glass-ceramics which may be potential candidates for a variety of technological applications, such as armor and display panels. (AU) | |
| Processo FAPESP: | 14/20865-9 - Síntese e propriedades de vitrocerâmicas contendo fase espinélio nanométrica para aplicações em sistemas de proteção e fotônicas. |
| Beneficiário: | Ana Candida Martins Rodrigues |
| Modalidade de apoio: | Auxílio à Pesquisa - Pesquisador Visitante - Internacional |
| Processo FAPESP: | 13/24064-8 - Estudos estruturais e fotofísicos de vidros fosfato de tungstênio dopados com íons terras raras e nanopartículas metálicas |
| Beneficiário: | Mohammad Reza Dousti |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 13/07793-6 - CeRTEV - Centro de Pesquisa, Tecnologia e Educação em Materiais Vítreos |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |