Title
An FTIR and ESR study of iron doped calcium borophosphate glassceramics
Author
M. Karabulut, A. Popa, G. Borodi, R. Stefan
Year
2015
Journal
Journal of Molecular Structure
Abstract
A series of glasses in the xFe2O3-(100-x) [42B2O3e24CaOe34P2O5] system has been prepared for x ¼ 0
e10. Structure of as casted glasses and their heat treated counterparts have been studied by X-ray
diffraction, infrared and electron spin resonance spectroscopies. Amorphous nature of all of the compositions
studied is confirmed by the XRPD spectra. After the heat treatment, besides the main BPO4
phase, CaBPO5 and Ca(PO3) crystalline phases were identified in the iron free glass while B0.57Fe0.43PO4
phase was also observed in the XRD pattern of iron containing samples. FTIR spectra indicate changes in
the glass network upon iron addition. X-band ESR spectra exhibits resonance signals at g ~ 2.0 and g ~ 4.3
for all analyzed samples. A supplementary line centered at g ~ 6 appears after the thermal treatment. The
nature of ESR absorption signals and influence of iron content on the evolution of ESR parameters are
discussed.
Instrument
FTIR-4100
Keywords
Fourier transform infrared spectroscopy, Borophosphate glasses, Crystal growth, X-ray diffraction, Infrared spectroscopy, Electron spin resonance