Structural, Thermal and Physical Properties of the Calcium Borovanadate Glasses Belonging to the 40CaO-(60-x)B2O3-xV2O5 System

Abstract

The calcium borovanadate glasses within the system 40CaO-(60-x)B2O3 -xV2O5 with x= 0, 5, 10, 15, 20, 30, 40 mol% was studied. The glass samples were elaborated via melting, followed by quenching. Its structural, thermal, and physical properties were explored. Powder X-ray diffraction was used to demonstrate that the developed glasses were amorphous. The influence of vanadium, a 3d transition element, on physical characteristics such as density and molar volume was investigated. The variation of density and molar volume has been discussed in terms of the structural changes in the vitreous matrix with adding the V2O5. Infrared (FTIR) and Raman spectroscopies were done to check the group constitution of the glass. This analysis shows that the vitreous materials are mainly established from BO4 and BO3 units with four and five coordinated vanadium in all glasses containing V2O5, confirmed with the density results. Moreover, it is found from the infrared spectra the existence of diborovanadate [B2V2O9]2- in glass samples with composition x =15, 20, 30, 40.