Iron effect on glass stability of sodium-calcium-phosphate glasses
Babes-Bolyai University, Faculty of Physics, M. Kogalniceanu Str. 1, 400084
Corresponding author: email@example.com
Accepted: 24 November 2006
Published online: 24 January 2007
Thermal stability of amorphous system xFe2O[ 20Na2O30CaO50P2O5] , with 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.
PACS: 61.43.Fs – Glasses / 65.60.+a – Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc / 76.30.-v – Electron paramagnetic resonance and relaxation
© EDP Sciences, 2007