摘要
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-CeO2稳定存在的成分范围；研究了La2O3-CeO2，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-CeO2稳定存在的成分范围为La摩尔配比大于0．70；La2O3-CeO2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-CeO2最稳定。
La2O3-CeO2 with different molar ratio of La to Ce were prepared by the coprecipitation method. The crystal structures of these samples were analyzed by XRD. The composition range of La2O3-CeO2 that existed steadily was deter- mined by the hydrogen reduction experiment of La2O3-CeO2. The characteristics of La2O3-CeO2 converting into hydroxide by the hydrothermal method was studied. The results showed that, when molar ratio of La to Ce ranged from 0. 85 to 0. 05, La2O3-CeO2 existed with face - centred cubic structure ; when the molar ratio was 0. 90 or 0. 95, La2O3-CeO2 existed with a new structure; and when the molar ratio was more than 0.7,La2O3-CeO2 could exist steadily. La2O3-CeO2 could be converted into La（OH） 3 -- Ce（OH） 3 by the hydrothermal method. When the molar ratio was 0. 7, the transformation condition was tougher than others, so the La2O3-CeO2 existed most steadily.
出处
《稀土》
EI
CAS
CSCD
北大核心
2013年第6期61-64,共4页
Chinese Rare Earths
关键词
氧化镧
氧化铈
结构
水热法
lanthanum oxide
cerium oxide
structure
hydrothermal method
