IMF2017

Polycrystalline ferroelectric ceramic samples of Cr³⁺ substituted Ba_0.90Sr_0.10TiO₃ were prepared by the solid state reaction method. The samples were substituted with Cr³⁺ at Ti-site up to 2 mol%. X-ray diffraction analysis confirmed the formation of single phase perovskite tetragonal structure with space group P4mm. Dielectric properties were measured as a function of temperature at different frequencies. Dielectric peak for all the samples can be noticed which is a typical ferroelectric to paraelectric transition. It was found that for the sample with 2% Cr³⁺ abnormal dielectric behaviour can be noticed within a small temperature range near transition temperature. The dielectric constant was found to increase with increase in frequency in this temperature range. Furthermore, the transition temperature shifts towards lower temperature as the frequency increases. The detailed study of structural and dielectric properties were done and discussed here.