Phase formation of BICUVOX solid solutions

Phase formation of Bi4(V1 - x Cu x ) 2O11 - z solid solutions (BICUVOX) with x = 0.00-0.20 and Δx = 0.02 was studied. The concentration stability ranges were determined for the α, β, and γ polymorphs of BICUVOX solid solutions at room temperature, and their unit cell parameters were revised. The following was found to occur as x rises: the α ⇄ β phase transition temperature between the monoclinic and orthorhombic phases shifts down, the β ⇄ γ phase transition temperature to the high-temperature tetragonal phase shifts down, and the order-disorder phase transition temperature between γ ⇄ γ tetragonal phases shifts up. © 2010 Pleiades Publishing, Ltd.