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Enhanced Thermostability, Thermo‐Optics, and Thermomechanical Properties of Barium Gallo‐Germanium Oxyfluoride Glasses and Glass‐Ceramics
Author(s) -
Zhang Shaoqian,
Xu Mingxiu,
Chen Xi,
Zhang Yuelong,
Calvez Laurant,
Zhang Xianghua,
Xu Yinsheng,
Huai Ying,
Jin Yuqi
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12477
Subject(s) - differential scanning calorimetry , materials science , glass transition , crystallization , scanning electron microscope , calcium aluminosilicate , ceramic , raman spectroscopy , analytical chemistry (journal) , mineralogy , refractive index , glass ceramic , composite material , optics , chemical engineering , aluminosilicate , chemistry , polymer , optoelectronics , thermodynamics , biochemistry , catalysis , physics , engineering , chromatography
Serial substitutions of BaF 2 for BaO in BaO – Ga 2 O 3 – GeO 2 glasses were performed, and the effects of the substitutions on the glass properties were investigated. The glass transition temperature, density, refractive index, thermo‐optics coefficient, and figure of merit for thermal shock decreased with the replacement of oxygen by fluorine. On the other hand, the glass‐forming ability increased. Fluorine substitution removed the absorption band of hydroxyl near 2.9 μm. Raman scattering spectroscopy was used to characterize the fluorogermanate glasses. The crystallization process of the glass‐ceramics under different heat‐treatment conditions was also investigated using differential scanning calorimetry, X‐ray diffraction, scanning electron microscopy, and atomic force microscopy. The thermal and mechanical properties were improved by controlling the crystal size of the near‐ and middle‐infrared transparent glass‐ceramics.