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Crystals of the Bi2GeO5–Bi4V2O11 System

A possibility of formation of new ferroelectric compounds and solid solutions has been concluded in particular on the basis of the established relationship between the crystal structures of Bi2BO55(B=Ge, Si) and Bi2BO6(B=W, Mo). Single crystals of new Bi4V2O11 compound and Bi4(Ge1-xVx)2O10+x solid solutions were synthesized. X-ray studies as well as studies of some dielectric and pyroelectric properties of crystals were carried out. It was found that the crystal structures of these new compound and solid solutions are related to those of Bi2BO5(B=Ge, Si) and ·Bi2BO6(B=W, Mo). The reversible first order phase transition was revealed at 550 K for Bi4GeVO10.5 grown from 3Bi2O3·2GeO2·V2O5 melt