Shimakawa Yuichi, Azuma Masaki, Ichikawa Noriya
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
Materials (Basel). 2011 Jan 7;4(1):153-168. doi: 10.3390/ma4010153.
New multiferroic compounds with double-perovskite structures were synthesized. Bi₂NiMnO₆ was synthesized in bulk form by high-pressure synthesis and also in a thin-film form by epitaxial growth. The material showed both ferromagnetic and ferroelectric properties, i.e., the multiferroic property at low temperature. Bi₂FeCrO₆ was also fabricated in a (1 1 1) oriented BiFeO₃/BiCrO₃ artificial superlattice, with a 1/1 stacking period. The superlattice film showed ferromagnetic behavior and polarization switching at room temperature. In the compounds, Bi ion, located at the A site in the perovskite structure, caused ferroelectric structural distortion, and the B-site ordering of the Ni and Mn ions (Fe and Cr ions) in a rock-salt configuration led to ferromagnetism according to the Kanamori-Goodenough rule.
合成了具有双钙钛矿结构的新型多铁性化合物。通过高压合成法制备了块状的Bi₂NiMnO₆，还通过外延生长法制备了薄膜形式的Bi₂NiMnO₆。该材料在低温下同时表现出铁磁性和铁电特性，即多铁性特性。Bi₂FeCrO₆也被制备成具有1/1堆叠周期的(1 1 1)取向的BiFeO₃/BiCrO₃人工超晶格。该超晶格薄膜在室温下表现出铁磁行为和极化切换。在这些化合物中，位于钙钛矿结构A位的Bi离子引起铁电结构畸变，而镍和锰离子（铁和铬离子）在岩盐构型中的B位有序排列根据金森-古德诺夫规则导致了铁磁性。
