多铁性化合物BiMn $_7$ O $_{12}$的合成与表征
Synthesis and characterization of multiferroic BiMn$_7$O$_{12}$
摘要：
我们报道了BiMn $_7$ O $_{12}$的高压合成，这是一种具有“四重钙钛矿”结构的锰氧化物。单晶样品的结构表征表明，由于$6s^{2}$孤对的存在，Bi原子周围的扭曲和不对称的配位，导致非中心对称空间群Im，导致永久的电偶极矩和铁电性质。另一方面，磁性表征揭示了反铁磁转变，在协议的同构化合物，从而证明了两个内在的属性，使BiMn $_7$ O $_{12}$一个有前途的多铁性材料。
英文摘要：
We report on the high pressure synthesis of BiMn$_7$O$_{12}$, a manganite displaying a "quadruple perovskite" structure. Structural characterization of single crystal samples shows a distorted and asymmetrical coordination around the Bi atom, due to presence of the $6s^{2}$ lone pair, resulting in non-centrosymmetric space group Im, leading to a permanent electrical dipole moment and ferroelectric properties. On the other hand, magnetic characterization reveals antiferromagnetic transitions, in agreement with the isostructural compounds, thus evidencing two intrinsic properties that make BiMn$_7$O$_{12}$ a promising multiferroic material.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
