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PMN-PT弛豫铁电固溶体的定向凝固组织与结晶习性

Structure and Grain Growth Habit of Directional Solidification Ceramics of （1-x）Pb(Mg_1/3Nb_2/3)O₃ - xPbTiO₃ （x=0.30, 0.33, 0.38） Relaxor Ferroelectric Solid Solutions

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【Author】 SUN Shi-Wen;PAN Xiao-Ming;LI Dong-Lin;LI Hong-Jun;ZHU Li-Hui;HUANG Qing-Wei;WANG Ping-Chu School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

【机构】上海大学材料学院；中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室；中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室上海 200072 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室；上海 200050；上海 200072；上海 200050；

【摘要】研究了（1-x）Pb(Mg_1/3Nb_2/3)O₃-xPbTiO₃（简称PMN-PT或PMNT）系铁电固溶体在坩埚下降法定向凝固过程中的结晶与晶粒生长习性.结果表明,随着坩埚下降速度的加快和PbTiO₃含量的降低,陶瓷晶粒的择优生长方向由[111]逐渐向[110]转变。更多还原

【Abstract】 This work describes the grain growth habit of the （1-x）Pb(Mg_1/3Nb_2/3) O_3-xPbTiO₃（PMN-PT or PMNT） system ferroelectric solid solutions prepared by a directional solidificationtechnique. The results show that the preferential direction of the grain growth depends not onlyon the composition of the melts, but also on the crucible pulling-down speed. For a fixed PMN/PTratio, e.g. 62/38, higher speed of crucible pulling-down leads to a preferential grain growth ori-entation of [110], rather than the [111], which is usually reported in single crystal growth studies,whereas lower crucible pulling-down speed tends to produce [111] grain-orientation ceramics. Whenthe crucible is pulled down at a certain rate, the preferential grain-growth orientation changes from[111] to [110] with reducing PbTiO₃ molar contents.更多还原