Title: Crystallisation kinetics of diopside-Ca-Tschermak based glasses nucleated with Cr2O3 and Fe2O3

Authors: Ashutosh Goel, Dilshat U. Tulyaganov, Ishu Kansal, Essam R. Shaaban, Jose M.F. Ferreira

Addresses: Department of Ceramics and Glass Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal. ' State Committee of Geology and Mineral Resources, Centre of Remote Sensing and GIS Technologies, 11-A, Shevchenko str., 100060, Tashkent, Uzbekistan. ' Department of Ceramics and Glass Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal. ' Physics Department, Faculty of Science, Al-Azhar University, Assuit71542, Egypt. ' Department of Ceramics and Glass Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal

Abstract: We report on the crystallisation behaviour and non-isothermal crystallisation kinetic studies of two diopside (CaMgSi2O6)-Ca-Tschermak (CaAl2SiO6) based glasses nucleated with Fe2O3 and Cr2O3. The two glasses with compositions corresponding to CaMg0.75Al0.5Si1.75O6 and Ca0.9Mg0.65Li0.1Al0.5La0.1Si1.75O6 were prepared by the melt-quenching technique. Structural investigations on the glasses have been made by density measurements, molar volume and infrared spectroscopy (FTIR). Non-isothermal crystallisation kinetic studies have been employed to study the mechanism of crystallisation in all the four glasses. Bulk crystallisation was obtained and augite crystallised out being the primary crystalline phase in both the glasses. Crystallisation sequence in the glasses has been followed by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and FTIR.

Keywords: glass ceramics; crystallisation kinetics; diopside; differential thermal analysis; DTA; aluminosilicates; scanning electron microscopy; SEM; melt quenching.

DOI: 10.1504/IJMATEI.2009.024026

International Journal of Materials Engineering Innovation, 2009 Vol.1 No.1, pp.40 - 60

Published online: 24 Mar 2009 *

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