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具有K2NiF4型结构的复合氧化物Sm2-xSrxNiO4的合成和结构测定
Synthesis and Crystal Structure of Rare Earth Complex Oxides Sm2-xSrx NiO4 with K2NiF4 Type
【摘要】 本文报导了Sm2-xSrxNiO4系列稀土复合氧化物的形成范围及其结晶化学特征。XRD分析表明,在0.4≤x≤1.2范围内,能形成K2NiF4型结构的稀土复合氧化物,随Sr掺入量x的增加,其结构由空间群为D2A23-Fmmm的正交晶系逐渐向空间群为D4h17I4/mmm的四方晶系过渡。本文从容纳因子t值、Ni离子的变价(Ni2+/Ni3+)和NiO6八面体的畸变角度探讨了Sr2+的掺入量对结构的影响。
【Abstract】 The rare earth complex Oxides Sm2-xSrxNiO4 were prepared by Sol-Gel method and characterized by powder XRD. The results showed that Sm2-xSrxNiO4 possessed K2NiF4 type structure within the range of 0.4≤x≤1.2. The space group transfered from orthorhombic D2k23-Fmmm to tetragonal D4k17-I4/mmm with increasing content of Sr2+ in the structure. The effect of Sr2+ substitution oh the structure was discussed in terms of tolerent facter (t), variable valence character of Ni ion (Mit+/ Ni3+) and distortion of NiO6 octahedra.
【Key words】 K2NiF4 type structure； rare earth complex oxide； synthesis； XRD；
- 【文献出处】 杭州大学学报(自然科学版) ,JOURNAL OF HANGZHOU UNIVERSITY(NATURE SCIENCE) , 编辑部邮箱 ,1994年02期
- 【分类号】O614
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