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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Crystallization, mechanical, and optical properties of transparent, nanocrystalline gahnite glass-ceramics

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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
Total Authors: 10
Document type: Journal article
Source: Journal of the American Ceramic Society; v. 100, n. 5, p. 1963-1975, MAY 2017.
Web of Science Citations: 8

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)

FAPESP's process: 13/24064-8 - Structural and photophysical studies of tungsten phosphate glasses doped with rare earth ions and metallic nanoparticles
Grantee:Mohammad Reza Dousti
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 14/20865-9 - Synthesis and property evaluation of novel nano spinel glass-ceramics for armor and photonic applications
Grantee:Ana Candida Martins Rodrigues
Support type: Research Grants - Visiting Researcher Grant - International