Singh, Shiv Prakash and Karmakar, Basudeb (2011) Synthesis and characterization of low softening point high Bi(2)O(3) glasses in the K(2)O-B(2)O(3)-Bi(2)O(3) system. Materials Characterization, 62 (6). pp. 626-634. ISSN 1044-5803

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Abstract

Synthesis of a new series of lead free low softening point (<470 degrees C) high Bi(2)O(3) (40-90 mol%) glasses in the K(2)O-B(2)O(3)-Bi(2)O(3) system by the melt-quench technique has been demonstrated here. Their structural, optical, thermal, electrical and other physical properties have been evaluated by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), FT-infrared reflection (FTIRR) spectroscopy, UV-Visible spectroscopy, dilatometer, LCR meter, etc. techniques. The glass softening point, glass transition temperature and glass deformation temperature are found to vary in the ranges 410-465 degrees C, 354-409 degrees C and 376-427 degrees C respectively which are found to correlate well with the boron anomaly phenomenon (as revealed by FTIRRS) with gradual addition of Bi(2)O(3) in the glass matrix. The coefficient of thermal expansion shows a decreasing trend from 153 down to 109 x 10(-7) K(-1) whereas the dielectric constant increases from 21 to 34 with the increase in Bi(2)O(3) content. The theoretical optical basicity is found to increase from 0.93 to 1.15 while the optical band gap decreases from 2.86 down to 2.30 eV with the addition of Bi(2)O(3). The formation of metallic bismuth in these glasses during melting in air has been confirmed by the XRD, TEM, selected area electron diffraction (SAED) and high resolution TEM (HRTEM) analyses. The formation of a Bi(2)O(3) rich secondary phase in the glasses and their particle size distribution have been examined by the FESEM photomicrograph analysis. (C) 2011 Elsevier Inc. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Amorphous materials; Quenching; Optical properties; Thermal expansion; X-Ray diffraction; Transmission electron microscopy
Subjects:	Glass
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	18 Jan 2012 06:41
Last Modified:	25 Feb 2013 08:49
URI:	http://cgcri.csircentral.net/id/eprint/352

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