Abstract
Two new polycrystalline layered oxides Bi2.33Ca0.17Nb1.33W0.17O7.5 and Bi2.25Ca0.25Nb1.25W0.25O7.5, in which the number of perovskite layers is equal to 1.5, have been synthesized. It has been revealed using X-ray powder diffraction analysis that both compounds have a single-phase composition and exhibit a structure of Aurivillius phases with orthorhombic unit cells corresponding to space group Cmm2. The analysis of the temperature dependences of the permittivity in the frequency range from 1 kHz to 1 MHz has demonstrated that these compounds are characterized by relaxor properties. This manifests itself in the frequency dispersion of the ferroelectric-paraelectric transition temperature and high values of the diffusivity parameter: γ = 1.75 and 1.82.
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