Journal
JOURNAL OF ASIAN CERAMIC SOCIETIES
Volume 3, Issue 4, Pages 390-401Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1016/j.jascer.2015.08.002
Keywords
Amorphous materials; Glasses; Optical materials; Chemical synthesis; Crystal growth; Differential scanning calorimetry (DSC); Ultrasonic measurements; Transmission electron microscopy (TEM)
Categories
Funding
- Academy of Scientific and Innovative Research (AcSIR)
- Council of Scientific and Industrial Research (CSIR)
- CSIR-Central Glass and Ceramic Research Institute
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Oxyfluoride glass-ceramics are extensively being investigated for their excellent optical properties and widespread use in photonic applications. But oxychloride systems are scarcely studied although they are potential candidates for those fields. Here we report chloroborosilicate glass system SiO2-B2O3-BaO-K2O-Al2O3-BaCl2 (mol%) within which BaCl2 nanocrystals have been generated by melt-quench technique followed by heat treatment. Samples were characterized by differential scanning calorimetry, X-ray diffraction, infrared and UV-vis spectroscopy, elastic constants measurement, etc. Micro- and nanostructures were analyzed by using FESEM, TEM and SAED. Formation and growth mechanism of BaCl2 nanocrystals have been demonstrated with the help of schematic representations. Size (7-47 nm) and morphology of the nanocrystals were found to be controlled by temperature and heat-treatment time. Activation energy for crystallization was determined by non-isothermal method using DSC and found to be 510 kJ/mol. Chloroborosilicate glasses containing BaCl2 nanocrystals having low-phonon energy (similar to 350 cm(-1)) are promising for different photonic applications. (C) 2015 The Ceramic Society of Japan and the Korean Ceramic Society. Production and hosting by Elsevier B.V. All rights reserved.
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