铌镁酸铅陶瓷的稀土元素及钛酸铅互掺改性研究  

Study on the Rare Earth Element and Lead Titanate Doping in Lead Magnesium Niobate Ceramics

作　　者：李惠琴[1] 刘敬松[1] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,绵阳621010

出　　处：《人工晶体学报》2012年第2期441-447,共7页Journal of Synthetic Crystals

基　　金：四川省教育厅青年基金项目(09ZB095);西南科技大学博士启动基金(08ZX7111)

摘　　要：本文采用了铌铁矿法,研究了稀土元素及钛酸铅(PT)的掺入对铌镁酸铅(PMN)铁电陶瓷的介电性能及拉曼行为的影响。分别掺入Y2O3、Sm2O3、La2O3稀土氧化物后,PMN的介电常数峰值(εm)有所下降,而掺入PT后εm有所上升。稀土元素的掺入使相转变温度(Tm)朝远离居里点的低温方向移动,室温下的介电损耗值减小,介电常数频率稳定性得到增强。PT的掺入使Tm朝接近居里点的高温方向移动。拉曼光谱研究表明稀土元素、PT的掺入影响了PMN陶瓷的B位有序度,导致其介电性变化。The columbite route was used in this work,and the influences of the addition of rare earth elements and PbTiO3（PT） on the dielectric properties and Raman behavior of Pb（Mg1/3Nb2/3）O3（PMN） ceramics were investigated.When Y2O3,Sm2O3 and La2O3 were added into PMN,the maximum of dielectric constant（εm） decreased.While PT was added,εm increased.The doping of rare earth elements resulted that the temperature of phase transition（Tm） moves to lower temperature far away the Curie point and dissipation factor at room temperature decreased,and the frequency dependence of dielectric constant get stabilized.The addition of PT moved Tm to higher temperature near the Curie point.The Raman investigation on the influence of rare earth elements and PT addition revealed that the change of chemical degree of B-site resulted in the dielectric property change.

关 键 词：铌镁酸铅 稀土掺杂 介电性能 相变弥散 B位有序度 

分 类 号：TQ163[化学工程—高温制品工业]