Structural investigation of SrO-BaO-TiO2-B2O3-P2O5 glass-ceramics

Abstract Glasses in the system xSrO-(20-x)BaO-10TiO2-30B2O3-40P2O5 with (0 ≤ x ≤ 20 mol %) have been synthesized by the melt-quenching method. The development of the glass-ceramics was carried out by heat controlled crystallization. The physical properties of the glasses such as density and molar volume are measured. The characteristic temperatures of the glasses are determined by using Differential Scanning Calorimetry (DSC) analysis. The results showed that the substitution of BaO by SrO leads to the opening of the glass structure. The identification of the crystalline phases formed in the glass–ceramic samples was performed by X-ray diffraction, while Raman spectroscopy was used in order to get information about the structural groups existing inside these materials. It was found that a distorted yavapaiite-type structure MTi(PO4)2 (M = Ba, Sr) phases and a boro-orthophosphate BPO4 one were crystallized in the glass-ceramics. Raman spectroscopic study has shown that the structure of the glass-ceramics contains mainly isolated PO4 and TiO6 units.