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Iron effect on glass stability of sodium-calcium-phosphate glasses

Published online by Cambridge University Press:  24 January 2007

V. Simon ,
D. Muresan  and
S. Simon
V. Simon*
Affiliation:
Babes-Bolyai University, Faculty of Physics, M. Kogalniceanu Str. 1, 400084 Cluj-Napoca, Romania
D. Muresan
Affiliation:
Babes-Bolyai University, Faculty of Physics, M. Kogalniceanu Str. 1, 400084 Cluj-Napoca, Romania
S. Simon
Affiliation:
Babes-Bolyai University, Faculty of Physics, M. Kogalniceanu Str. 1, 400084 Cluj-Napoca, Romania
*
viosimon@phys.ubbcluj.ro
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Abstract

Thermal stability of amorphous system xFe2O$_{3}(100-x)$[ 20Na2O$\cdot $30CaO$\cdot $50P2O5] , with $x \le 20$ mol%, was investigated by differential thermal analysis (DTA). Critical crystal radii are evaluated using the molar volumes and the thermal glass stabilities. Partial crystallisation of samples was obtained by heat treatment carried out for 24 hours at two temperatures. The sites occupied by iron in glass and partially crystallised samples are characterised according to electron paramagnetic resonance (EPR) results.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 37 , Issue 2 , February 2007 , pp. 219 - 222
Copyright
© EDP Sciences, 2007

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