PMN-PT弛豫型铁电材料的凝固组织与相结构  

Solidified microstructure and phase structure of relaxor ferroelectrics PMN-PT

作　　者：惠增哲[1] 刘改琳[1] 刘江南[1] 杨通[1] 

机构地区：[1]西安工业学院材料科学与工程系,陕西西安710032

出　　处：《西安工业学院学报》2002年第2期151-154,共4页Journal of Xi'an Institute of Technology

基　　金：陕西省教育厅专项科学研究基金 (99JK189)

摘　　要：采用熔融法制备了PMN - 32PT弛豫型铁电晶粒 ,研究了自由凝固条件下PMN - 32PT晶体的生长形貌、组织形态、相结构和择优生长方向 .结果表明 ,自由凝固条件下 ,从熔体中生长出的PMN - 32PT晶体一般呈现三棱柱和八面体两种形态 ;PMN - 32PT晶体的择优生长方向为 <2 11>晶向 ;凝固过程中熔剂不足会引起组分中MgO的优先树枝状结晶 ;生长速度对PMN - 32PT晶体的完整性有较大影响 ,生长速度过快会导致熔剂夹杂 .A high temperature flux method was used to grow relaxor ferroelectrics of PMN-32PT crystals. The crystal morphology, microstructure, phase structure,and primary growth direction during free solidification were studied. The result indicated that PMN-32PT crystals usually manifest two morphologies as triangularprism and octahedron. The primary growth is usually in <211> direction. If PbO is inadequate, MgO will primarily grow as dendrite before PMN-32PT crystal growth during free solidification. Flux will be attached in PMN-32PT crystal if solidification is too fast.

关 键 词：铁电材料 相结构 PMN-PT 弛豫型铁电体 凝固组织 晶体生长 熔融法 

分 类 号：O782[理学—晶体学]