Title :
Modulated DSC and fragility studies on diborate glasses containing heavy metal ion
Author :
Reddy, M. Sudhakara ; Rajiv, A. ; Vishwanatha, R. ; Reddy, C. Narayana
Author_Institution :
Dept. of Phys., Jain Univ., Bangalore, India
Abstract :
Glasses in a wide range of compositions in the system xPbO - (100-x) Na2B4O7 (10 S × ≥ 50) have been prepared and characterized using XRD and modulated differential scanning calorometry(DSC). Quantitative correlations are established between fragility, glass transition temperature and structure. Addition of PbO causes a change in short range order of the diborate matrix. The modification of diborate network with the addition of PbO, results in the formation of B-O-Pb covalent linkages. Density, molar volume and glass transition temperature exhibit composition dependent trends. The fragility increases with increase in concentration of PbO. Analysis of the modulated DSC data reveals the investigated glasses are fragile.
Keywords :
X-ray diffraction; borate glasses; differential scanning calorimetry; glass structure; glass transition; lead compounds; materials preparation; short-range order; sodium compounds; B-O-Pb covalent linkages; PbO-Na2B4O7; X-ray diffraction; XRD; composition dependent trends; diborate glasses; diborate matrix; diborate network modification; fragility studies; glass structure; glass transition temperature; heavy metal ion; modulated DSC; modulated differential scanning calorimetry; molar volume; quantitative correlations; short-range order; Glass transition; diborate; modulated DSC; packing density;
Conference_Titel :
Research & Technology in the Coming Decades (CRT 2013), National Conference on Challenges in
Conference_Location :
Ujire
Electronic_ISBN :
978-1-84919-868-4
DOI :
10.1049/cp.2013.2556
