ChemInform Abstract: Anisotropic Thermal Expansivity of Some Zircon-Type Rare Earth Arsenates.
Abstract
The lattice parameters a and c of the zircon-type tetragonal arsenates YAsO4, ErAsO4, and YbAsO4, which may be of interest as host materials for solid state lasers and radioactive wastes, are determined as a function of temp. by powder XRD in temp. range 300-889 K. The lattice parameters increase with increasing temp. and the axial thermal expansion coefficients αa and αc are anisotropic (αa < αc) with the anisotropy increasing from YAsO4 to YbAsO4.
ChemInform Abstract
The lattice parameters a and c of the zircon-type tetragonal arsenates YAsO4, ErAsO4, and YbAsO4, which may be of interest as host materials for solid state lasers and radioactive wastes, are determined as a function of temp. by powder XRD in temp. range 300-889 K. The lattice parameters increase with increasing temp. and the axial thermal expansion coefficients αa and αc are anisotropic (αa < αc) with the anisotropy increasing from YAsO4 to YbAsO4. This thermal behavior is similar to that observed in their isotypic compounds DyVO4, GdVO4, YVO4, and zircon and can be explained in terms of the strength of the interatomic bonds in the a and c directions.
