The transition from dielectric-temperature stability to diffuse phase transition behavior induced by the sintering temperature for (Ba0.93La0.07)(Ti0.93Tb0.07)O3 ceramics

Results in Physics

Da-Yong Lu¹  Yan-Yan Peng² 

[1] Corresponding author.;Key Laboratory for Special Functional Materials in Jilin Provincial Universities, Jilin Institute of Chemical Technology, Jilin 132022, PR China;

关键词: La/Tb co-doped BaTiO3;    Dielectrics;    Point defects;    Tb4+;    Electron paramagnetic resonance;   

DOI  :  

来源: DOAJ

【 摘 要 】

Nominal (Ba0.93La0.07)(Ti0.93Tb0.07)O3 ceramics (BLTT7) were prepared at different sintering temperatures of Ts = 1100–1400 °C using a mixed-oxide method. The electron paramagnetic resonance (EPR) of Tb4+ in BLTT7 acted as a probe to investigate the effect of Ts on the transition from dielectric-temperature stability to diffuse phase transition behavior. Three tetragonal BLTT7 ceramics sintered at Ts = 1100, 1200 and 1300 °C exhibited increasing dielectric-temperature stability, whereas the pseudocubic BLTT7 sintered at Ts = 1400 °C exhibited a diffuse phase transition behavior with higher permittivity and the temperature stability. A so-called core-shell structure should be responsible for the flattening of the Curie peak at Ts ≤ 1300 °C. The higher Ts (=1400 °C) led to a complete incorporation of La/Tb ions in the BaTiO3 lattice and the collapse of the core-shell structure. The transfer of Tb4+ from the shell at Ts ≤ 1300 °C to the perovskite lattice at Ts = 1400 °C was confirmed by EPR. The solid solution formation of BLTT7 sintered at different Ts is discussed.

【 授权许可】

Unknown