Phase diagram study of BaOBi2O3V2O5 system

The sub-solidus phase relations in BaBiVO quaternary system were determined at 1123 K in air. To confirm the formation and stability of reported phases at this temperature, ternary and quaternary compounds in BaOBi2O3, Bi2O3V2O5, BaOV2O5 and BaOBi2O3V2O5 systems were synthesized by solid state route. BaCO3, Bi2O3 and NH4VO3 were reacted in desired molar proportions at 1123 K. A pseudo-ternary phase diagram of BaOBi2O3V2O5 system was drawn on the basis of phase analysis of various phase mixtures and reported phases and phase fields were established by powder X-ray Diffraction (XRD). In the phase diagram, a single quaternary compound Ba2BiV3O11 was identified. Thermal Expansion (TE) behavior and heat capacity (Cp) measurement of Ba2BiV3O11 were carried out using High-Temperature X-Ray Diffraction (HTXRD) technique and Differential Scanning Calorimeter (DSC), respectively.