Authors:
K. Shah Bhabha Atomic Research Center Technical Physics and Prototype Engineering Division Mumbai 400 085 India

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M. Goswami Bhabha Atomic Research Center Technical Physics and Prototype Engineering Division Mumbai 400 085 India

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D. Aswal Bhabha Atomic Research Center Technical Physics and Prototype Engineering Division Mumbai 400 085 India

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V. Shrikhande Bhabha Atomic Research Center Technical Physics and Prototype Engineering Division Mumbai 400 085 India

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S. Gupta Bhabha Atomic Research Center Technical Physics and Prototype Engineering Division Mumbai 400 085 India

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G. Kothiyal Bhabha Atomic Research Center Technical Physics and Prototype Engineering Division Mumbai 400 085 India

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Abstract  

PbO based phosphate glasses having composition 40P2O5�12Al2O3�6B2O3�9PbO�xNa2O�(33−x)K2O (x=0−33) [F=Na/(Na+K)] have been prepared using conventional melt quench technique. Density, morphology, thermal expansion coefficient (α) and glass transition temperature (Tg) were studied as a function of Na/(Na+K) ratio. Formation of transparent, bubble free and clear glass was observed up to x=18 mol%. Density was found to vary from 2.70 to 3.69 g cm−3. The significant changes were noticed in external morphologies at temperatures corresponding to softening, half ball and melting points under high temperature microscope for three compositions (x=0, 10 and 15 mol%). These glasses recorded the softening and half ball temperatures in the range 454–470�C and 523–576�C respectively and melting temperatures agree well with DTA studies within the experimental limits. Glass transition temperature showed a broad maxima while thermal expansion coefficient (TEC) a broad minima around Na/(Na+K)=0.54. This behaviour is explained on the basis of bond formation/phase separation.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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