Effect of Al₂O₃ nano-particles on Ba(Zr_0.95Ti_0.05)O₃ ceramics prepared by mixed oxide method

Abstract

In this study, the effect of Al₂O₃ nano-particles on Ba(Zr_0.95Ti_0.05)O₃ or BZT ceramics prepared by mixed oxide method with various amount of Al₂O₃ were investigated. The BZT powders were calcined at 1100 °C for 3 h with heating rate of 5 °C/min. The sintering procedure of BZT + x wt.% Al₂O₃ nano-particles (x = 0.3, 0.7 and 1.0) was carried out at 1300 °C for 2 h with heating rate of 5 °C/min. The results showed that, all XRD patterns of BZT + x wt.% Al₂O₃ nano-particles ceramics could be matched with a JCPDS data file number 06-0399. The BZT + 0.7 wt.% Al₂O₃ nano-particles ceramic was showed the highest density about 5.9 g/cm³, Vickers micro-hardness was 8.9 GPa, dielectric constant was 2005 and dielectric loss was 0.01 at 1 kHz frequency.

Keywords:

• BZT ceramics
• Al₂O₃ nano-particles
• dielectric properties
• Vickers micro-hardness

Acknowledgments

Honest thanks and true gratefulness are given to Faculty of Science, Naresuan University. The author would like to thank Prof. Dr. Tawee Tunkasiri and Prof. Dr. Gobwute Rujijanagul for their help in many facilities [Materials Science Research Laboratory (MSRL), Department of Physics and Materials Science, Chiang Mai University].