caa a22 4500 463190963 CHVBK 20180406164909.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10973-006-7517-2 doi (NATIONALLICENCE)springer-10.1007/s10973-006-7517-2 Effect of Na2O/K2O substitution on thermophysical properties of PbO based phosphate glasses [Elektronische Daten] [K. Shah, M. Goswami, D. Aswal, V. Shrikhande, S. Gupta, G. Kothiyal] 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 (T g) 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. Springer Science+Business Media LLC, 2007 glass transition nationallicence high temperature microscopy nationallicence phosphate glasses nationallicence thermal expansion coefficient nationallicence Shah K. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut Goswami M. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut Aswal D. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut Shrikhande V. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut Gupta S. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut Kothiyal G. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/1(2007-07-01), 153-157 1388-6150 89:1<153 2007 89 10973 https://doi.org/10.1007/s10973-006-7517-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7517-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shah K. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut NATIONALLICENCE 700 1- Goswami M. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut NATIONALLICENCE 700 1- Aswal D. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut NATIONALLICENCE 700 1- Shrikhande V. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut NATIONALLICENCE 700 1- Gupta S. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut NATIONALLICENCE 700 1- Kothiyal G. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, 400 085, Mumbai, India aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/1(2007-07-01), 153-157 1388-6150 89:1<153 2007 89 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer