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采用共沉淀法制备了不同镧、铈摩尔配比的混合稀土氧化物La2O3-CeO2,进行了X射线衍射结构分析;采用氢气还原La2O3-CeO2实验,确定了La2O3-Ce2O3稳定存在的成分范围;研究了La2O3-Ce2O3水热法转化氢氧化物的特性。实验结果表明:混合稀土氧化物La2O3-CeO2,当La摩尔配比0.85~0.05范围均以CeO2面心立方结构存在;而La摩尔配比为0.90、0.95的样品形成一种新型的结构;La2O3-Ce2O3稳定存在的成分范围为La摩尔配比大于0.70;La2O3-Ce2O3水热法可以转化为La(OH)3-Ce(OH)3,当La摩尔配比为0.70时,转化条件较为苛刻,形成的La2O3-Ce2O3最稳定。
The mixed rare earth oxide La2O3-CeO2 with different molar ratios of lanthanum and cerium was prepared by coprecipitation method and analyzed by X-ray diffraction. The composition of La2O3-Ce2O3 stabilized by hydrogen reduction was determined by hydrogen reduction of La2O3-CeO2. La2O3-Ce2O3 Hydrothermal Conversion of Hydroxide Characteristics. The experimental results show that La2O3-CeO2 mixed with rare-earth oxides exists in the CeO2 face-centered cubic structure when the molar ratio of La is 0.85-0.05; La2O3-LaO2- The composition of Ce2O3 is stable when the molar ratio of La is greater than 0.70. La2O3-Ce2O3 can be converted to La (OH) 3-Ce (OH) 3 by hydrothermal method. When La molar ratio is 0.70, La2O3-Ce2O3 is the most stable.