Structural Characterization of R2Cu2O5 (R = Yb, Tm, Er, Y, and Ho) Oxides by Neutron Diffraction
Structural Characterization of R2Cu2O5 (R = Yb, Tm, Er, Y, and Ho) Oxides by Neutron Diffraction
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通过中子衍射表征 R2Cu2O5（R = Yb、Tm、Er、Y 和 Ho）氧化物的结构
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Rodríguez
中科院分区：
文献类型：
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作者：
J. García;J. Rodríguez
用高分辨中子粉末衍射研究了R2 Cu 2 O 5族化合物的结构特征。该等构系列属于非中心对称空间群Pna 21。比较研究了稀土对结构参数的影响。除了预期的R O 6八面体的膨胀时，稀土离子半径是不同的，结构的主要修改对应于在CuO 5金字塔的顶端Cu-O距离的伸长。相反，基面保持不变。一个系统的结构稳定性的变化被发现取决于稀土原子的大小。
Abstract The structural features of the R2 Cu2O5 family of compounds have been studied by high-resolution neutron powder diffraction. This isostructural series belongs to the noncentrosymmetric space group Pna21. A comparative study of the influence of the rare earth on the structural parameters is presented. In addition to the expected expansion of the R O6 octahedra when the rare earth ionic radii are varied, the main modification of the structure corresponds to the elongation of the apical Cu-O distance in the CuO5 pyramid. Conversely, the basal plane remains unchanged. A systematic variation of the structural stability is found depending on the size of the rare earth atom.