国内外钢中稀土夹杂物的鉴定中,至今尚未发现(RE)OF型夹杂物。我们在高氟炉渣冶炼含稀土的合金时,发现了一种深灰色、形状不规则的稀土夹杂物(见图1);暗场透粉红色,偏光下呈现红色,强异性。电子探针分析,含有稀土、氧和氟。X-射线衍射分析,出现接近四方晶系LaOF的衍射 In the identification of rare earth inclusions in steel at home and abroad, so far no (OF) OF inclusions have been found. We found a dark gray, irregularly shaped rare earth inclusion (see Figure 1) when smelting a high-fluorine slag containing a rare earth alloy; the dark field was pink and reddish and strongly anisotropic under polarized light. Electron probe analysis, containing rare earths, oxygen and fluorine. X-ray diffraction analysis revealed diffraction approaching tetragonal LaOF