Study on New material with Multiferroic Properties by Means of Containerless Solidification

到目前为止，我们已经报道了在LuFeO3中，无容器处理可以促进形成具有多铁性质的亚稳六方相（h-LuFeO3）。然而，h-LuFeO3的磁性不是铁磁性而是反铁磁性，阻碍了该材料的实际应用。为了解决这一问题，我们研究了适合纳米级复合材料的化学成分和加工条件，因为这两相的纳米级混合物的形成是获得多铁性能的潜在方法之一。结果表明，少量Fe3+取代Mn2+稳定了h-LuFeO3，抑制了平衡正交相（o-LuFeO3）的析出，因此Lu(femn1 -x) 2+yO4+z是一种潜在的材料。

Until now, we have reported that in LuFeO3 the containerless processing can facilitate the metastable hexagonal phase(h-LuFeO3) with multiferroic properties to be formed. However, the magnetic properties of h-LuFeO3, which are not ferromagnetic but antiferromagnetic, prevent the material to be used practically. In order to solve this problem, we examined the chemical composition and the processing condition which are suited for a nano-scaled composite, because the forming of a nano-scaled mixture of these two phases is one of the potential methods for the multiferroic properties. As a result, we reached the conclusion that Lu(FexMn1-x) 2+yO4+z is one of the potential materials, because the substitution of a small fraction of Fe3+to Mn2+stabilizes the metastable h-LuFeO3, and suppresses the precipitation of the equilibrium orthorhombic phase(o-LuFeO3).