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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and thermoelastic properties of Zr(CN2)(2) and Hf(CN2)(2)
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Synthesis and thermoelastic properties of Zr(CN2)(2) and Hf(CN2)(2)

机译:Zr(CN2)(2)和HF(CN2)(2)的合成和热弹性性能

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摘要

Two binary transition metal cyanamides, Zr(CN2)(2) and Hf(CN2)(2), were prepared by solid-state metathesis (SSM) reactions and separately controlled by differential thermoanalysis (DTA). The crystal structure of Hf(CN2)(2) was solved and refined from a single-phase crystal powder by X-ray diffraction (XRD) in the space group Pbcn. Zr(CN2)(2) was characterized by isotypic indexing. The crystal structure of M(CN2)(2) compounds with M = Zr, Hf is closely related to that of LiY(CN2)(2), but reveals large cavities due to the absence of lithium ions. Hf(CN2)(2) exhibits thermoelastic properties characteristic of a flexible framework material. The calculated phonon energies, elastic tensor, and thermal expansion tensor are presented; the volumetric coefficient of thermal expansion is predicted to be near-zero under ambient conditions (alpha(V) = -3.5 x 10(-6) K-1).
机译:通过固态复分解(SSM)反应制备两个二元过渡金属氰酰胺,Zr(CN2)(2)和HF(CN2)(2),并通过差动热解[型)分别控制。 通过空间组PBCN中的X射线衍射(XRD)从单相晶体粉末溶解并改进HF(CN2)(2)的晶体结构。 Zr(CN2)(2)的特征在于异型指数。 M(CN2)(2)化合物的晶体结构与M = Zr,HF与Liy(CN2)(2)的晶体结构密切相关,但由于不存在锂离子而揭示大腔。 HF(CN2)(2)表现出柔性框架材料的热弹性特性。 计算出的声子能量,弹性张力和热膨胀张量; 在环境条件下预测容积热膨胀系数在零附近(α(v)= -3.5×10(-6)k-1)。

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