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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >The structure, characterization, and magnetic properties of Ca4-xNixIrO6 (x = 0.25, 0.5)
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The structure, characterization, and magnetic properties of Ca4-xNixIrO6 (x = 0.25, 0.5)

机译：Ca4-xNixIrO6（x = 0.25，0.5）的结构，表征和磁性能

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摘要

Ca4-xNixIrO6 (x=0.25, 0.5) crystallizes with trigonal (rhombohedral) symmetry in the space group R(3) over bar c, Z = 6, for Ca3.75Ni0.25IrO6 a = 9.3013(1) Angstrom, c = 11.1554(1) Angstrom; for Ca3.5Ni0.5IrO6 a = 9.2723(1) Angstrom, c = 11.0825(1) Angstrom. Ca3.75Ni0.25IrO6 and Ca3.5Ni0.5IrO6 are isotypic to compounds of the Sr4PtO6 structure type. The structure of Ca3.75Ni0.25IrO6 has been solved by means of single crystal X-ray diffraction data analysis with the reliability factors of R = 0.019 and R-w = 0.022. Also, both structures have been determined by Rietveld refinement of powder X-ray diffraction data. The structure consists of chains of alternating face-sharing IrO6 octahedra and (Ca/Ni)O-6 trigonal prisms. The chains are separated by the calcium cations which are in a distorted square antiprismatic coordination. Magnetic measurements revealed that both Ca3.75Ni0.25IrO6 and Ca3.5Ni0.5IrO6 follow Curie-Weiss behavior at high temperatures. Ca3.75Ni0.25IrO6 undergoes a single antiferromagnetic transition at T-N = 5 K whereas Ca3.5Ni0.5IrO6 undergoes two antiferromagnetic transitions at T-N1 = 13 K and T-N2 = 4 K. [References: 18]
机译：Ca4-xNixIrO6（x = 0.25，0.5）在空间c（Z = 6）上在空间组R（3）中以三角（菱形）对称结晶，Ca3.75Ni0.25IrO6 a = 9.3013（1）埃，c = 11.1554 （1）埃;对于Ca3.5Ni0.5IrO6，a ＝ 9.2723（1）埃，c ＝ 11.0825（1）埃。 Ca3.75Ni0.25IrO6和Ca3.5Ni0.5IrO6与Sr4PtO6结构类型的化合物同型。 Ca3.75Ni0.25IrO6的结构已通过单晶X射线衍射数据分析得以解决，其可靠性因子为R = 0.019和R-w = 0.022。同样，两种结构都通过粉末X射线衍射数据的Rietveld精修确定。该结构由交替面共享的IrO6八面体和（Ca / Ni）O-6三角棱镜组成的链组成。链被钙阳离子隔开，钙阳离子处于扭曲的方形反棱柱配位形式。磁性测量表明，Ca3.75Ni0.25IrO6和Ca3.5Ni0.5IrO6在高温下均遵循居里-魏斯行为。 Ca3.75Ni0.25IrO6在T-N = 5 K时经历一个反铁磁跃迁，而Ca3.5Ni0.5IrO6在T-N1 = 13 K和T-N2 = 4 K时经历两个反铁磁跃迁。[参考文献：18]

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