镧掺杂对0.7BiFeO_3-0.3BaTiO_3微观结构和性能的影响

Effect of Manganese Doping on Microstructure and Properties of 0.7 BiFeO_3-0.3 BaTiO_3 Solid Solutions

在已有的对0.7BiFeO3-0.3BaTiO3固溶体研究的基础上,对其进行A位替代研究。采用传统陶瓷工艺制备了0.7B iFeO3-0.3BaTiO3-xmol%La2O3二元系固溶体,其中x=0.6,0.8,1.0,1.2。所有陶瓷样品具有稳定的单一钙钛矿结构,随着镧掺杂量的增加,陶瓷晶粒逐渐减小,居里温度逐渐降低,陶瓷样品的矫顽场逐渐降低,介电损耗逐渐变小。

Binary solid solutions 0.7 BiFeO3 - 0.3 BaTiO3 - x tool% La203 （ X = 0.6, 0.8,1.0, 1.2 ） are prepared by the traditional ceramics process. The phase structures of all ceramics samples are of pure and steady Perovskite phase, and no other phases are found. With the increase of La doping amount, the grain size of the ce- ramic is decreased, the Curie temperature is gradually dropped. The coercive field of the samples is decreased and the dielectric loss is gradually lowered.