Paper Title:
Non-Isothermal Crystallisation of SiO2-MgO-K2O-3CaO·P2O5 Glass Studies by Impedance Spectroscopy
  Abstract

Impedance spectroscopy was used to monitor the non-isothermal crystallisation of a phosphate phase in bulk samples of a glass with the molar composition 0.45SiO2–0.36MgO– 0.09K2O–0.1(3CaO⋅P2O5), intended for biomedical applications. The K+ alkali ions are probably the main charge carriers in glass of this composition [1]. Impedance spectra were obtained as a function of temperature, following non-isothermal heat treatments at 2°Cmin-1. It is shown that suitable analysis of impedance spectra can be used to evaluate the crystallization peak of a orthophosphate phase, Ca9MgK(PO4)7. Results obtained by this method are comparable to those obtained by differential thermal analysis (DTA) of the corresponding glass frits. Impedance spectroscopy is thus suitable to study the crystallization of bulk samples, and can be used both with variable temperature and under isothermal conditions.

  Info
Periodical
Materials Science Forum (Volumes 514-516)
Edited by
Paula Maria Vilarinho
Pages
1078-1082
DOI
10.4028/www.scientific.net/MSF.514-516.1078
Citation
C. M. Queiroz, M. H. F.V. Fernandes, J. R. Frade, "Non-Isothermal Crystallisation of SiO2-MgO-K2O-3CaO·P2O5 Glass Studies by Impedance Spectroscopy", Materials Science Forum, Vols. 514-516, pp. 1078-1082, 2006
Online since
May 2006
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