Processing and electrical properties of BiFeO3-PbTiO3 ceramics
Processing and electrical properties of BiFeO3-PbTiO3 ceramics
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DOI：
10.1016/j.matlet.2004.07.021
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发表时间：
2004-12
影响因子：
3
通讯作者：
T. Comyn;S. McBride;A. Bell
中科院分区：
文献类型：
--
作者：
T. Comyn;S. McBride;A. Bell
用混合氧化物法制备了(1−x)BiFeO_3-(X)PbTiO_3多晶陶瓷，其密度超过了理论密度的95%。X射线衍射研究表明，完全烧结的材料是纯相的，并且接近菱形和四方形变的钙钛矿结构之间的准同型相界。在1015C和1025C之间烧结的材料即使在高温下也表现出高的电阻率，使得相对介电常数可以测量到居里点并通过居里点，目前发现居里点为650C。对极化磁滞回线的测量表明，该材料的矫顽场接近15千伏mm−1。
Polycrystalline (1−x)BiFeO3–(x)PbTiO3ceramics (where x=0.3) have been produced via a mixed oxide route with densities in excess of 95% of the theoretical. X-ray diffraction studies indicate that the fully sintered materials are phase pure and close to the morphotropic phase boundary (MPB) between the rhombohedrally distorted and tetragonally distorted perovskite structures. Materials sintered between 1015 and 1025 °C display high resistivities, even at elevated temperatures, allowing the relative permittivity to be measured up to and through the Curie point, presently found to be 650 °C. Measurements of polarization-field hysteresis loops indicate that the coercive field for this material approaches 15 kV mm−1.