Abstract
Pechini polymeric precursor method was successfully used to synthesize (Ba 0.95Ca 0.05)(Ti 0.85Zr 0.15)O 3 nano powders. The results of TG/DTA, XRD and IR analyses showed that by heating the precursor between 490 °C and 580 °C, an intermediate phase with possible composition of (Ba,Ca) 2(Ti,Zr) 2O 5CO 3 was formed. Between 580 °C and 700 °C, the intermediate phase transformed to a crystalline solid solution by de-carbonation reaction. The transformation completed at 700 °C. Nano-sized powders with equivalent sphere diameters about 72 nm were obtained by calcination of the precursor at 700 °C for 4 h. The ceramics sintered at 1300 °C for 2 h can reach about 95% theoretical density and the peak dielectric constant is 15,000 at 70 °C.
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