Abstract Distortions of hydroxide octahedral complexes in the CoIInAlIII layered double hydroxides (LDHs) (n = CoII/AlIII = 2 and 3) were studied as a function of the ratio of divalent-to-trivalent cations and temperature. A method for calculation the magnetic susceptibility of polycrystalline samples taking into account the statistical distribution of divalent and trivalent cations, and their effect on the distortions of the original structure is proposed. It is shown that the presence of a local maximum on the magnetic susceptibility curve of ConAl LDHs compounds near T ∼ 160 K is due to freezing of the lattice parameters and, as a consequence, freezing of the tilting fluctuations of the O–H bonds.

中文翻译：

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温度相关八面体畸变对含钴双层氢氧化物磁性能的影响

摘要 研究了 CoIInAlIII 层状双氢氧化物 (LDH) (n = CoII/AlIII = 2 和 3) 中氢氧化物八面体配合物的畸变与二价与三价阳离子之比和温度的关系。提出了一种计算多晶样品磁化率的方法，该方法考虑了二价和三价阳离子的统计分布，以及它们对原始结构畸变的影响。结果表明，在 T ～ 160 K 附近 ConAl LDHs 化合物的磁化率曲线上存在局部最大值是由于晶格参数的冻结，因此，O-H 键的倾斜波动的冻结。