Temperature stability, structural evolution and dielectric properties of BaTiO3 Bi(Mg2/3Ta1/3)O3 perovskite ceramics

Lead-free ((1-x))BaTiO3-xBi(Mg2/3Ta1/3)O-3 [(1-x)BT-xEMT, 0 <= x <= 0.1] perovskite solid solutions were synthesized via the conventional solid state reaction technique. Raman spectra and XRD analysis demonstrate that a systematically structural evolution from a tetragonal to pseudo-cubic phase occurred near 0.01 < x < 0.03. A phenomenon from a normal ferroelectric behavior to diffusive and dispersive relaxor-like characteristic was also observed. As BMT content further increases (0.06 <= x <= 0.1), the temperature stability of permittivity was markedly improved (Delta epsilon/epsilon(30) degrees C <= +/- 15%), high relative permittivity (similar to 1000-2000) and low loss (<= 2%) were obtained over a wide temperature range from 30 degrees C to 150 degrees C at 1 kHz. Moreover, when x=0.08 and 0.1, Delta epsilon/epsilon(30) degrees C was <= +/- 10%. These results indicate that (1-x)BT-xEMT ceramics could be suitable for thermally stable dielectric applications. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.