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《Journal of Inorganic Materials》 2004-03
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Structure and Grain Growth Habit of Directional Solidification Ceramics of (1-x)Pb(Mg_(1/3)Nb_(2/3))O_3 - xPbTiO_3 (x=0.30, 0.33, 0.38) Relaxor Ferroelectric Solid Solutions

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  
This work describes the grain growth habit of the (1-x)Pb(Mg_(1/3)Nb_(2/3)) O_(3-x)PbTiO_3 (PMN-PT or PMNT) system ferroelectric solid solutions prepared by a directional solidification technique. The results show that the preferential direction of the grain growth depends not only on the composition of the melts, but also on the crucible pulling-down speed. For a fixed PMN/PT ratio, 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. When the crucible is pulled down at a certain rate, the preferential grain-growth orientation changes from [111] to [110] with reducing PbTiO_3 molar contents.
【Fund】: 国家自然科学基金(50072040)
【CateGory Index】: O732
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