Effects of Calcination Temparetaure on the Phase Formation and Microstructure of Barium Zinc Tantalate

Nowadays, high dielectric materials are important materials in microwave electronic applications due to its properties that can provide high frequency range of an antenna. Barium Zinc Tantalate (BZT) is a complex perovskite structure that can produce high quality factor, Q. In this research, the effect of calcinations temperatures on phase formation, density and morphology of BZT powders were investigated. Based on the DTA result, the range of calcinations temperatures to be investigated were between 750 degrees C to 1250 degrees C. Results show that the maximum density of BZT occurred at 1150 degrees C with 99.74% theoretical density. Samples calcined at below 1100 degrees C still containing their raw materials such as BaCO3, ZnO and Ta2O5. The pure phase of BZT was formed at 1150 degrees C when calcined for 1 hour. The lattice distortion of BZT increased when the calcinations temperature increased between 1000 degrees C to 1150 degrees C. The calcined powders show almost spherical morphology and agglomerated. The particle sizes of BZT increased from 0.716 mu m to 0.258 mu m when the temperature increased from 750 degrees C to 1200 degrees C.