Designed ferromagnetic, ferroelectric Bi2NiMnO6
Designed ferromagnetic, ferroelectric Bi2NiMnO6
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DOI：
10.1021/ja0512576
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发表时间：
2005-06-22
影响因子：
15
通讯作者：
Takano, M
中科院分区：
文献类型：
--
作者：
Azuma, M;Takata, K;Takano, M
采用高压合成法在6GPa下合成了一种新的铁磁、铁电化合物Bi_2NiMnO_6。晶体结构，由同步辐射X射线粉末衍射测定，是一个严重扭曲的双钙钛矿与Ni2+和Mn4+离子在岩盐配置有序。Bi~（3+）离子的6s（2）孤对电子和Bi-O共价键的存在使样品具有铁电性质，其T-CE为485 K，而-Ni~（2+）-O-Mn~（4+）-O-Ni~（2+）-磁路使样品具有铁磁性，其T-CM为140 K。这种在Bi-和Pb-基钙钛矿的B位点上分布具有和不具有e（g）电子的两种磁性元素的简单材料设计可以应用于其他Bi 2 M 2 + M 4 + O 6和Pb 2 M 3 + M 5 + O 6系统以寻找更新的铁磁铁电体。
A newly designed ferromagnetic, ferroelectric compound, Bi2NiMnO6, was prepared by highpressure synthesis at 6 GPa. The crystal structure, as determined by synchrotron X-ray powder diffraction, is a heavily distorted double perovskite with Ni2+ and Mn4+ ions ordered in a rock-salt configuration. The presence of 6s(2) lone pairs of Bi3+ ions and the covalent Bi-O bonds give ferroelectric properties with T-CE of 485 K, while -Ni2+-O- Mn4+-O-Ni2+- magnetic paths lead to a ferromagnetism with T-CM of 140 K. This simple material design to distribute two magnetic elements with and without e(g) electrons on B sites of Bi- and Pb-based perovkites can be applied to other Bi2M2+M-'4+O-6 and Pb2M3+ M'5+O6 systems to search for newer ferromagnetic ferroelectrics.