Structure and crystallization behaviour of some MgSiO3-based glasses
Artikel i vetenskaplig tidskrift, 2009

We report on the structure and crystallization behaviour of four enstatite based glasses. Two glasses with nominal compositions of Y0.125Mg0.875Si0.875B0.125O3 and Y0.125Mg0.725Ba0.15Si0.875B0.125O3 were prepared as parent glasses while the other two glasses were derived by the addition of 8 wt.% Al2O3 to the parent glass compositions, respectively. Structural features of the glasses were accessed by Fourier transform infrared spectroscopy (FTIR). Non-isothermal crystallization kinetics and thermal stability of Al2O3-free glasses were studied using differential scanning calorimetry (DSC). It has been shown that these glasses exhibit higher activation energy of viscous flow and are prone to surface crystallization. Activation energy of crystallization decreases with the addition of BaO in the glasses. Crystallization behaviour of all the experimental glasses in the temperature range of 800–1000 °C was followed by X-ray diffraction (XRD) and FTIR. Clinoenstatite and orthoenstatite were the major crystalline phases in the BaO-free glass-ceramics while BaO-containing compositions featured the early formation and stabilization of protoenstatite.

D. Glass

A. Sintering

D. Silicate

D. Glass-ceramics

Författare

Ashutosh Goel

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Dilshat U. Tulyaganov

Centro de Investigacao em Materiais Ceramicos e Compositos

Centre of Remote Sensing and GIS Technologies

Essam R. Shaaban

Al-Azhar University

Christopher Knee

Göteborgs universitet

Sten Eriksson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

José M.F. Ferreira

Centro de Investigacao em Materiais Ceramicos e Compositos

Ceramics International

0272-8842 (ISSN)

Vol. 35 1529-1538

Ämneskategorier

Kemi

DOI

10.1016/j.ceramint.2008.08.012