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Subsolidus binary phase diagram of (n-C n H2n+1NH3)2ZnCl4 (n = 14, 16, 18)

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Abstract

The thermotropic phase solid–solid transitions compound (n-C n H2n+1NH3)2ZnCl4 (n = 14, 16, 18) were studied, and a series of their mixtures were prepared. These laminar materials contain bilayers sandwiched between metal halide layers. The low temperature crystal structures of the pure salts are characteristic of the piling of sandwiches in which a two-dimensional macro-anion ZnCl4 2− is sandwiched between two alkylammonium layers. These layers become conformationally disordered in the high temperature phases. The subsolidus binary phase diagrams of (n-C14H29NH3)2ZnCl4-(n-C18H37NH3)2ZnCl4 and (n-C16H33NH3)2ZnCl4-(n-C18H37NH3)2ZnCl4 were established by differential thermal analysis and X-ray diffraction. In each phase diagram, an intermediate compound and two eutectoid invariants were observed. There are three noticeable solid solution ranges (α, β, γ) at the left boundary, right boundary, and middle of the phase diagram.

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Acknowledgements

This project was financially supported by National Natural Science Foundation of China (No. 20773034), Natural Science Foundation of Hebei Province (No. E2009000307), Education Department Scientific Research Fund from Hebei Province (No. 2008469), and Science Foundation of Hebei Normal University (L2006B16, L2008Z07).

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  1. Department of Chemistry and Material Science, Key Laboratory of Inorganic Nano-materials of Hebei Province, Hebei Normal University, 113 YuHua Rd., Shijiazhuang, 050016, China

    Kezhong Wu & Jianjun Zhang

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  1. Kezhong Wu
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  2. Jianjun Zhang
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Correspondence to Kezhong Wu.

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Wu, K., Zhang, J. Subsolidus binary phase diagram of (n-C n H2n+1NH3)2ZnCl4 (n = 14, 16, 18). J Therm Anal Calorim 101, 913–917 (2010). https://doi.org/10.1007/s10973-010-0806-9

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  • DOI: https://doi.org/10.1007/s10973-010-0806-9

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