Non-isothermal crystallisation of SiO2-MgO-K2O-3CaO center dot P2O5 glass studies by impedance spectroscopy
authors Queiroz, CM; Fernandes, MHV; Frade, JR
editors Vilarinho, PM
nationality International
journal ADVANCED MATERIALS FORUM III, PTS 1 AND 2
author keywords glass crystallisation; electrical conductivity; impedance spectroscopy; whitlockite
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 0.45SiO(2)-0.36MgO-0.09K2O-0.1(3CaO(.)P(2)O(5)), intended for biomedical applications. The K+ alkali ions are probably the main charge carriers in glass of this composition [I]. Impedance spectra were obtained as a function of temperature, following non-isothermal heat treatments at 2 degrees 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.
publisher TRANS TECH PUBLICATIONS LTD
issn 0255-5476
year published 2006
volume 514-516
beginning page 1078
ending page 1082
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000238056400215
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