Preparation and Characterization of Relaxor Ferroelectric 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 by a Polymerizable Complex Method
Preparation and Characterization of Relaxor Ferroelectric 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 by a Polymerizable Complex Method
复制标题
DOI：
10.1111/j.1551-2916.2009.03004.x
复制
发表时间：
2009-06
影响因子：
3.9
通讯作者：
Haifa Zhai;Rong-Lu Tang;Aidong Li;Hai-Rong Guo;Yidong Xia;Di Wu
中科院分区：
文献类型：
--
作者：
Haifa Zhai;Rong-Lu Tang;Aidong Li;Hai-Rong Guo;Yidong Xia;Di Wu
采用新型水溶性Nb前驱体，采用改进的可聚合络合（PC）法制备了弛豫铁电陶瓷0.65Pb（Mg 1/3 Nb 2/3）O3-0.35PbTiO3（PMN-PT）。系统研究了Pb含量和烧结温度对PMN-PT粉体和陶瓷的结构、形貌、组成和电性能的影响。研究发现，改进的PC法可以有效地将钙钛矿相的初始晶化温度降低到500°C。对于铅含量过量15%的PMN-PT样品，在600°C下烧结2小时，可以获得87%的钙钛矿相，远高于相同温度下传统固态反应和其他溶液法的钙钛矿相含量。在进一步将烧结温度提高到1100°C时，钙钛矿相含量基本保持恒定。这是由于铅缺乏烧绿石相的形成。当烧结温度提高到1250°C时，PMN-PT陶瓷的介电常数和剩余极化率显著提高，这是由于晶粒尺寸增大、致密度提高和烧绿石相减少。在1250°C下制备了钙钛矿相含量为98.5%的PMN-PT陶瓷。其剩余极化强度为18 μC/cm 2，矫顽场为9.6 kV/cm，压电系数d33=360 pC/N，室温和最大介电常数分别为3600和10500（1 kHz），具有典型的铁电弛豫特性。
A modified polymerizable complex (PC) method for the preparation of the relaxor ferroelectric 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 (PMN–PT) ceramics has been developed using a novel water-soluble Nb precursor. The effects of Pb content and sintering temperature on the structure, morphology, composition, and electrical properties of PMN–PT powders and ceramics were investigated systematically. It was found that the modified PC method could effectively reduce the initial crystallization temperature of the perovskite phase to 500°C. For PMN–PT samples with 15% excess Pb content sintered at 600°C for 2 h, the 87% perovskite phase can be achieved, which is much higher than that in conventional solid-state reactions and other solution-based methods at the same temperature. On further increasing the sintering temperature to 1100°C, the perovskite phase content basically remains constant. This is attributed to the Pb-deficient pyrochlore phase formation. On increasing the sintering temperature to 1250°C, the dielectric constant and remnant polarization of PMN–PT ceramics significantly improved due to the larger grain sizes, enhanced density, and the decreasing pyrochlore phase. PMN–PT ceramics with a 98.5% content of the perovskite phase have been fabricated at 1250°C. It displays typical ferroelectric relaxor characteristics with a remnant polarization of 18 μC/cm2, a coercive field of 9.6 kV/cm, a piezoelectric coefficient of d33=360 pC/N, and room-temperature and maximum dielectric constants of 3600 and 10 500 at 1 kHz, respectively.