相界附近Pb(Zn_(1/3)Nb_(2/3))O_3-PbZrO_3-PbTiO_3固溶体的弛豫相变研究

STUDY OF RELAXOR PHASE TRANSITION OF Pb(Zn_(1/3) Nb_(2/3))O_3-PbZrO_3-PbTiO_3 SOLID SOLUTION NEAR MORPHOTROPIC PHASE BOUNDARY 

利用常规电子陶瓷工艺在相界附近合成得到纯钙钛矿相的Pb(Zn1/ 3Nb2 / 3)O3 PbZrO3 PbTiO3(PZN PZT)三元系固溶体 ,其相界位于Zr/Ti比 3 7/ 3 3处 .在实验中发现和证实了相界附近PZN PZT三元系固溶体存在铁电 弛豫 顺电相变 .在极化后Zr/Ti比为 3 7/ 3 3及 3 9/ 3 1PZN PZT样品的介电温度谱观测到菱方 四方相相变 ,认为PZN PZT固溶体相界是向富Zr区弯曲 .

Pure perovskite phase of PZN\|PZT solid solution near morphotropic phase boundary (MPB) has been prepared by conventional electric ceramic engineering. The Zr/?Ti ratio of the MPB of PZN\|PZT solid solution is about 37/?33. The ferroelectric\|to\|relaxor\|paraelectric phase transition of PZN\|PZT solid solution near MPB has been identified when the sample is heated. In addition, the transition from rhombohedral to tetragonal has been found for the poled samples with Zr/?Ti ratio to be 37/?33 and 39/?31. It is believed that the MPB of PZN\|PZT bends toward Zr\|rich region.