Preparation, characterization and dielectric properties of solid solution Ca_ (1-x)Sr_xZrO_3
Ca_ 1-xSr_xZrO_3(CSZ) powders were synthesized successfully by the oxalate coprecipitation process.In this study,oxalate acid and a mixture solution of CaCl_2, SrCl_ 2and ZrOCl_2 were used as reactants and the product was a precursor of CSZ.TG-DTA curves were employed to characterize the thermal decomposition behavior of the precursor and gave an initial temperature of formation of CSZ crystal.The XRD results revealed also that when heating temperature was up to 1000℃, the powder crystallized was a full solid solution with cubic structure and the relationship of lattice parameter (a) and x agreed with the Vergard’s law.The CSZ powder calcined at 1100℃ was sintered at 1450℃.The SEM micrograph of the sintered ceramics showed that the average grain size was around 0.7 μm,and the relative density of the ceramics was 93.0%.The dielectric constant of the Ca_ 0.8Sr_ 0.2ZrO_3 with Sr 2+ in solid solution (x) of 0.2 measured at room temperature and under the high frequency of 10 MHz was 27.6.