Thanatep Phatungthane, Gobwute Rujijanagul, Kamonpan Pengpat, Sukum Eitssayeam, Tawee Tunkasiri, Luiz F. Cótica, Ruyan Guo e Amar S. Bhalla

Current Applied Physics – Volume: 14; Issue: 12; Pages: 1819–1824; DOI:10.1016/j.cap.2014.09.026

In this work, ((1−x)Ba(Fe1/2Ta1/2)O3-xBa(Zn1/3Ta2/3)O3), ((1−x)BFT-xBZT) ceramics with x = 0.00–0.12 were synthesized by the solid–state reaction method. X-ray diffraction data revealed that both the powders and ceramics were of a pure-phase cubic perovskite structure. All ceramics showed large dielectric constants. For the x = 0.12 sample, a very high dielectric constant (>20,600) was observed. A lowering in the dielectric loss compared to pure BFT ceramics was observed with the BZT addition. The impedance measurements indicated that BZT has a strong effect on the bulk grain and grain boundary resistance of BFT ceramics. These results are in agreement with the measured dielectric properties. Based on dielectric and impedance results, (1−x)BFT-xBZT ceramics could be of great interest for high performance dielectric materials applications due their giant dielectric constant behavior.