Synthesis and characterization of Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ relaxor ferroelectrics modified by Ba(Mg_1/3Nb_2/3)O₃

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• 作者：Jinghan Gao ; Qiang Li ; Nengneng Luo ; Qingfeng Yan ; Yiling Zhang ; Xiangcheng Chu
• 关键词：C. Dielectric properties ; D. Perovskite ; Morphotropic phase boundary
• 刊名：Ceramics International
• 出版年：January, 2014
• 年：2014
• 卷：40
• 期：1_part_PA
• 页码：487-493
• 全文大小：2221 K

文摘

0.05Ba(Mg_1/3Nb_2/3)O₃-(0.95鈭?em>x)Pb(Mg_1/3Nb_2/3)O₃-xPbTiO₃ [0.05BMN-(0.95鈭?em>x)PMN-xPT] relaxor ferroelectrics have been synthesized by solid-state reaction. Phase structure and microstructure were characterized by means of X-ray diffraction and scanning electron microscopy (SEM). Dielectricity, piezoelectricity and ferroelectricity were also investigated. A partial phase diagram for this system was established based on the X-ray diffraction and dielectric measurements. A morphotropic phase boundary (MPB) area was identified within the composition range of x=0.33-0.36. A maximum d₃₃=585 pC/N could be obtained in 0.05BMN-0.60PMN-0.35PT. With increasing PT content, the behavior of as-prepared ceramics gradually shifts from relaxor to normal ferroelectrics. This pseudo-ternary system also possesses an enhanced ferroelectricity compared to BMN-PT and BZN-PT.