近化学计量比钽酸锂畴反转特性研究  

Domain structure inversion characterization of near stoichiometric lithium tantalate

作　　者：贾宝申[1] 赵业权[1] 张学锋[1] 申岩[1] 何焰蓝[2] 

机构地区：[1]哈尔滨工业大学航天学院,哈尔滨150001 [2]国防科技大学物理系,长沙410073

出　　处：《物理学报》2008年第9期5670-5674,共5页Acta Physica Sinica

基　　金：中国工程物理研究院基金(批准号:10676038)资助的课题~~

摘　　要：采用助熔剂提拉法生长了非掺杂及掺镁近化学剂量比钽酸锂晶体.氢氟酸腐蚀晶片的金相显微镜观察结果显示,化学剂量比钽酸锂的畴结构为六边形.利用自行研制的极化设备对晶体进行极化实验,采用外加短脉冲极化电场,测定了近化学计量比钽酸锂单晶的畴反转特性,得到了完全反转的畴结构.Pure and MgO doped near stoichiometric lithium tantalate has been grown by adding flux method. The observation of the crystal wafers etched by hydrofluoric acid under metallographic microscope indicate that the domain structure of near stoichiometric lithium tantalate is hexagonal. Polarization experiments have been done by using the equipment made by ourselves. By using short-impulsed polarization electric field, several parameters, including the positive and negative direction coercive force field and polarization time were investigated. Polarization current and entirely reversed domain structure were obtained.

关 键 词：近化学剂量比钽酸锂 畴结构 矫顽场 极化电流 

分 类 号：O482[理学—固体物理]