| 摘要 |
PURPOSE:To obtain a compound having a hexagonal system laminar structure represented by TmFeMgO4 by mixing Tm, Fe and Mg or oxides thereof in a specified atomic ratio and heating the mixture at a proper temp. in a specified atmosphere. CONSTITUTION:Tm, Tm2O3 or a compound decomposable into Tm2O3 by heating is mixed with Fe, Fe2O3 or a compound decomposable into Fe2O3 by heating and Mg, MgO or a compound forming MgO by heating in the form of powder so as to make the atomic ratio among Tm, Fe and Mg 1:1:1. This mixture is heated at >=1,200 deg.C in the air, an oxidizing atmosphere or a reducing atomosphere to such a degree that Fe and Mg are not reduced from the tervalent ionic state and the bivalent ionic state, respectively, and after finishing the reaction, the reaction product is rapidly cooled. By this method a brown TmFeMgO4 compound having a hexagonal system laminar structure is obtd. This compound is useful as a magnetic material, a semiconductor material and a catalyst. |
