Structure and dielectric properties of wet-chemically prepared calcium ytterbium niobate

Abstract

The crystal structure and dielectric properties of wet-chemically prepared Ca₂YbNbO₆ ceramics have been investigated. It is difficult to obtain a single phase of Ca₂YbNbO₆ by conventional solid state reaction with the appropriate oxides or carbonates. In this work, it was prepared by the wet-chemical method with Ca- and Yb-nitrates, Nb-chloride and citric acid. We obtained a single phase powder by heat treatment at 1000°C for 10 hrs. X-ray diffraction results show that Ca₂YbNbO₆ has an orthorhombic structure (a ₀ = 0.556 nm, b ₀ = 0.575 nm, c ₀ = 0.800 nm), which is based on the B-site ordered perovskite structure. Investigation of the crystal structure and dielectric properties as a function of temperature showed no structural phase change.