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通过对 L a2 O3 粉末在空气中吸水的增重测定及增重前后的 X射线衍射结构分析 ,发现 L a2 O3 吸水之后转变成 L a(OH) 3 。因此 ,L a2 O3 是一种化学性质不稳定的化合物 ,从前文献中关于“L a2 O3 是一种化学性质稳定的氧化物”的观点值得商榷。
By measuring the weight gain of L a 2 O 3 powder in air and analyzing the structure of X-ray diffraction before and after weight gain, L a 2 O 3 was found to be transformed into L a (OH) 3 after absorbing water. Therefore, L a 2 O 3 is a chemical unstable chemical compound, the previous literature on “L a 2 O 3 is a chemically stable oxide” point of view is open to question.