The indium sesquioxide with over 99% purity can be prepared by a decomposition of nitric acid. The method was characterized by fewer equipments, simple operation, low cost and quick yield.

采用硝酸分解法制取度高于99%的三氧化二铟.本法具有设、作简单、成本低、见效快等优点.

High purity titanium sesquioxide was obtained by the reaction of high purity hydrogen and titanium dioxide in the presence of titanium tetrachloride.

用高氢和高二氧化钛，四氯化钛存，以得到高三氧化二钛。

VD and working procedure.Experiments showed that major of the LF step foreign inclusions are aluminium sesquioxide. spotted non-deforming inclusion and sulphuret.

VD及成材工序现场取样.系统分析了各工序中夹杂物的行为.特征.数量.变化历程及影响因素.实验结果表明.