Molla, Atiar Rahaman and Rodrigues, Alisson M and Singh, Shiv Prakash and Lancelotti, Ricardo Felipe and Zanotto, Edgar D and Rodrigues, Ana C M and Dousti, Mohammad Reza and de Camargo, Andrea S S and Magon, Claudio Jose and Almeida Silva, Igor D'Anciaes (2017) Crystallization, mechanical, and optical properties of transparent, nanocrystalline gahnite glass-ceramics. Journal of the American Ceramic Society, 100 (5). pp. 1963-1975. ISSN 0002-7820

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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.

Item Type: Article
Subjects: Glass
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 25 Jan 2018 11:58
Last Modified: 25 Jan 2018 11:58

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