X-ray diffractometric study and electrophysical properties of phases in the CaTa2O6- NdTa3O9 system

Abstract

The method of x-ray diffraction analysis is used for studying phase formation in the CaTa2O6 – NdTa3O9 system at up to 1400°C. It is shown that there exists a region of solid solutions of a rhombic crystal system based on NdTa3O9, the boundary of homogeneity of which lies at up to 40 mol.% CaTa2O6. Specimens of the studied solid solutions possess an elevated dielectric constant (e ∼ 50 at room temperature). The temperature dependences of the electrical conductivity and the dielectric constants of the solid solutions in the range 20 – 450°C show that the polarization has a relaxation nature.