高等学校化学学报

高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (7): 877.

• 论文 • 上一篇    下一篇

Pr(Ⅳ)复合氧化物Ce0.8Pr0.2O2的制备及结构研究

杨瑛, 杨汝栋   

  1. 兰州大学化学系, 兰州, 730000
  • 收稿日期:1991-07-16 出版日期:1992-07-24 发布日期:1992-07-24
  • 通讯作者: 杨瑛
  • 基金资助:

    国家自然科学基金资助课题

Preparation and Structure Study of Pr(Ⅳ) Composite Oxides Ce0.8Pr0.2O2

YANG Ying, YANG Ru-dong   

  1. Department of Chemistry, Lanzhou University, Lanzhou, 730000
  • Received:1991-07-16 Online:1992-07-24 Published:1992-07-24

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摘要： 研究了用臭氧氧化法及草酸盐分解法制备Pr(Ⅳ)复合氧化物Ce0.8Pr0.2O2的过程,通过测定各种Ce:Pr摩尔比下所形成产物中Pr(Ⅳ)的含量,确定出当Ce:Pr≥4:1时,复合氧化物中的Pr(Ⅳ)全部为正四价态.X射线粉末衍射分析结果表明,化学计量式为Ce0.8Pr0.2O2的复合氧化物为面心立方晶格,其晶胞参数明显不同于CeO2和PrO2.据此推断了Ce0.8Pr0.2O2的空间结构,并讨论了Pr(Ⅳ)能稳定存在的原因.

关键词: 四价错, 复合氧化物, 制备, 结构

Abstract: Pr (Ⅳ) composite oxides Ce0.8Pr0.2O2 was prepared by means of ozonizing the co-precipitated Ce(Ⅱ)and Pr(Ⅱ) hydroxides or heating the coprecipitated Ce(Ⅱ) and Pr(Ⅱ) ox-alates.Chemical analysis and X-ray powder diffraction results show that this compound has a flourite structure similar to CeO2 and PrO2, but its crystal cell constants are different from theirs obviously.In this compound Pr(Ⅳ) is more stable than in pure PrO2, we can attribute this to the existence of Ce(Ⅳ), which makes Pr (Ⅳ)—O2- distance longer than in other Pr(Ⅳ) oxides.

Key words: Tetravalent praseodymium, Composite oxides, Preparation, Structure

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