An FTIR and ESR study of iron doped calcium borophosphate glass-ceramics

作者：Karabulut M; Popa A; Borodi G; Stefan R^*

来源：Journal of Molecular Structure, 2015, 1101: 170-175.

DOI：10.1016/j.molstruc.2015.08.004

• Borophosphate glasses
• Crystal growth
• X-ray diffraction
• Infrared spectroscopy
• Electron spin resonance

A series of glasses in the xPe(2)O(3)-(100-x) [42B(2)O(3)-24CaO-34P(2)O(5)] system has been prepared for x = 0 -10. 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 similar to 2.0 and g similar to 4.3 for all analyzed samples. A supplementary line centered at g similar to 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.

• 出版日期2015-12-5