Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
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Formation of transparent glass-ceramics including thermodynamically metastable cubic phase in Na2Mn0.5Fe0.5SiO4 glass
Miyuri TERASAWATsuyoshi HONMATakayuki KOMATSU
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2018 Volume 126 Issue 6 Pages 421-423

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Abstract

Optically transparent and electrically conductive glass-ceramics have been successfully prepared from 1Na2O–0.5MnO–0.5FeO–1SiO2 (Na2Mn0.5Fe0.5SiO4) glass by heat-treatment. Crystallization tendency was sensitive to the valence state of transition metal oxide. The as-quenched glass melted at 1400°C for 15 min, exhibited two exothermic peaks in the differential thermal analysis. Optically transparent glass-ceramics obtained at 493°C for 3 h showed simple X-ray diffraction pattern, which could be assigned to a cubic phase with a lattice constant of 0.74511 nm. A monoclinic Na2MSiO4 (M = Mn, Fe) phase appeared with the heat treatment above 610°C, suggesting that the crystal phase precipitated in the low temperature region was thermodynamically metastable. The transparent glass-ceramics showed an order of magnitude higher electrical conductivity than that of glass and the monoclinic phase.

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© 2018 The Ceramic Society of Japan
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