Thermal deformations of copper pyrovanadate

Thermal deformations of the crystal structure of alpha -CU2V2O7 were shown to be anisotropic. With temperature increasing to 280 degreesC, its unit ce ll volume first decreases, then increases. Thermal and concentration phase transitions are accompanied by a decrease in unit cell volume for the whole isoformula series of pyrovanadates. Using Cu2(1-x)Mn2xV2O7 as the example, we have demonstrated the possibility of predicting the extent of solid sol utions, based on the similarity in thermal deformations and crystal lattice deformations upon the formation of substitutional solid solutions.