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中文摘要：
0．65Pb（Mg1／3Nb2／3）O3—0．35PbTiO3（简称：PMN-PT）弛豫铁电粉体采用两步无机盐-凝胶法制备。以氧化镁，醋酸铅，钛酸丁脂为原料，柠檬酸为螫合剂，乙二醇为溶剂，分别合成稳定的Mg，Pb-Ti的有机化合物先驱体溶液。Nb2O5粉体与Mg先驱体溶液均匀混合，并采用溶胶-凝胶工艺制备MgNb2O6（MN）先驱体粉体；MN粉体与Pb-Ti先驱体溶液均匀混合，并制备PMN-PT粉体。通过XRD和SEM分析PMN-PT钙钛矿相形成的影响因素和微观形貌，研究全钙钛矿相PMN-PT铁电粉体的制备。结果表明：过量3％MgO前驱体经1050℃，4h煅烧可以得到纯相MgNb2O6先驱体粉体：过量5％PbO前驱体经900℃，4h煅烧可以得到全钙钛矿相PMN-PT粉体。
英文摘要：
A relaxor ferroelectric material, 0.65Pb（Mg1/3Nb2/3）O3-0.35PbTiO3 （ PMN-PT ） powder without pyrochlore phase, was prepared by a two-stage polymerized complex method. The reactive columbite （ MgNb2O6 ） phase was synthesized by the polymerized complex method at 1050℃ for 4 h with 3% excess MgO. Lead acetate and tetrebutyl titanate were used to synthesize pyrochlore-free PMN-PT powder with 5% excess lead via the columbite route, from 800 ℃ to 900 ℃, in air for 4 h. X-ray diffraction and scanning electron microscopy were used to detect the perovskite phase evolution and the presence of the pyrochlore phase in PMN-PT. The formation of perovskite PMN-PT is a function of the time and temperature conditions of the precursor calcinations, and an optimum condition for the thermal decomposition of the precursor was determined to avoid the formation of the pyrochlore phase.
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