PrBi4Fe0.5Co0.5Ti3O15多铁陶瓷的性能研究

采用传统固相反应法与两步合成法制备了PrBi₄Fe_0.5Co_0.5Ti₃O₁₅陶瓷, 研究了Pr与Co共掺杂对Bi₅FeTi₃O₁₅陶瓷的结构、磁性能以及介电性能的影响。X射线衍射分析显示, 传统固相反应法制备的样品比两步法制备的样品更容易形成单相结构。铁电和磁性测量证明样品具有多铁性, 并且Pr与Co共掺杂能大幅提高材料的磁性能, 固相反应法与两步合成法制备的样品在室温下的剩余磁化强度(2M_r)分别为0.315, 0.576 Am²/kg, 比文献报道的Bi₅FeTi₃O₁₅陶瓷的2M_r ( 2.7 Am²/kg ) 高5个数量级, 比掺Co的Bi₅Fe_0.5Co_0.5Ti₃O₁₅陶瓷2M_r ( 7.8×10^-3 Am²/kg ) 高2个数量级。

Properties of Multiferroic PrBi4Fe0.5Co0.5Ti3O15 Ceramics

PrBi₄Fe_0.5Co_0.5Ti₃O₁₅ compounds were prepared either by conventional solid-state reaction method or by two-step method. X-ray diffraction analyses indicate that the PrBi₄Fe_0.5Co_0.5Ti₃O₁₅ samples which were synthesized by the conventional solid-state reaction method favors the formation of single phase four-layer Aurivillius phase more easily than the samples prepared by the two-step method. The multiferroic properties of the samples at room temperature were demonstrated by ferroelectric and magnetic measurements. The samples exhibit significantly enhanced magnetic properties by Pr/Co co-substitution. The remnant magnetization (2M_r) of the samples prepared by the conventional solid-state reaction and two-step methods are 0.315 and 0.576 Am²/kg, respectively, approximately five orders larger than that of the reported Bi5FeTi₃O₁₅ ceramics (2.7×10^-6 Am²/kg) and two orders of the reported Co-doped Bi₅FeTi₃O₁₅ ceramics (7.8×10^-3 Am²/kg).