| 摘要 |
PURPOSE:A novel compound consisting of a compound oxide of Tm, Ga and Co, expressed by TmGaCoO4, and having the hexagonal layered structure. CONSTITUTION:Tm, Tm2O3 or a compound decomposable into Tm2O3 by heating is mixed with Ga, Ga2O3 or a compound decomposable into Ga2O3 by heating and Co, CoO or a compound decomposable into CoO by heating. The respective particle diameters thereof are preferably <=about 10mum. The atomic ratio of Tm/Ga/Co is 1:1:1. The resultant mixture is then heated at 1,000 deg.C or above in the air, an oxidizing atmosphere or such a reducing atmosphere as not to reduce Ga and Co from the trivalent and bivalent ionic states. After the completion of the reaction, the reaction mixture is guenched to 0 deg.C or quickly taken out to the air and give the aimed LuGaCoO4 compound. The compound assumes a black color and is found to have the crystal structure by the powder X-ray diffractometry and the same type as the well-known YFe2O4. |
