| K2NiF4型希土复合氧化物Eu2-xSrxNiO4+δ的合成、结构及还原性能 |
| PREPARATION, CRYSTAL STRUCTURE AND REDUCIBILITY OF K2NiF4 TYPE OXIDES Eu2-xSrxNiO4+δ |
|
| 摘要: 利用柠檬酸配合物分解法合成了单相的K2NiF4型希土复合氧化物Eu2-xSrxNiO4+δ(0.5≤x≤1.2)，粉末X射线衍射分析表明，在x为0.6～0.7的范围内，物相从空间群为Fmmm的正交相转变成空间群为I4/mmm的四方相，随着Sr2+的加入，部分Ni2+转变为Ni3+，其转变量与理论值接近。反映结构稳定性的高温还原峰温与晶胞参数c有对应关系，表明化合物的结构稳定性取决于AO层与ABO3层的层间距离。 |
| 关键词: K2NiF4型结构 希土复合氧化物 粉末X射线衍射 |
| 基金项目: |
| Abstract: K2NiF4 type compounds Eu2-xSrxNiO4+δ (0.5≤x≤1.2) have been prepared by a citric acid complex decomposition method. The powder X-ray diffraction data showed that there is a crystal system transformation from orthorhombic Fmmm to tetragonal I4/mmm at around x=0.6 to 0.7. The valences state of nickel in the samples are increased with the Sr substitution, which does not deviate much from theoretical data. The variation of Tmax,h, in TPR profiles, is opposite to the cell parameter c with increasing x, which means that the structural stability of Eu2-xSrxNiO4+δ is related to the distance between the layers of perovskite and rocksalt. |
| Keywords: K2NiF4 type structure rate earth complex oxides X-ray powder diffraction |
| |
| 摘要点击次数: 1428 |
| 全文下载次数: 1304 |
| 楼辉,徐元植,陈平,葛玉平,吕光烈,马福泰.K2NiF4型希土复合氧化物Eu2-xSrxNiO4+δ的合成、结构及还原性能[J].无机化学学报,1999,15(2):158-164. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
