https://doi.org/10.1051/epjap:2007013
Iron effect on glass stability of sodium-calcium-phosphate glasses
Babes-Bolyai University, Faculty of Physics, M. Kogalniceanu Str. 1, 400084
Cluj-Napoca, Romania
Corresponding author: viosimon@phys.ubbcluj.ro
Received:
23
March
2006
Accepted:
24
November
2006
Published online:
24
January
2007
Thermal stability of amorphous system
xFe2O
[ 20Na2O
30CaO50P2O5] ,
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
