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四氯合锌酸十六烷基铵-四氯合锌酸十八烷基铵二元体系亚固相相图

于化江1,2,武克忠2*   

  1. (1.沧州师范学院 沧州 061001；2.河北师范大学化学与材料科学学院 石家庄 050016)
  • 收稿日期:2011-02-21 修回日期:2011-04-12 出版日期:2012-01-10 发布日期:2012-01-10
  • 通讯作者: 武克忠,教授; Tel/Fax:0311-86268049; E-mail:wukzh688@163.com; 研究方向：材料物理化学
  • 基金资助:
    国家自然科学基金(21073052)河北省自然科学基金(E2009000307)河北省教育厅基金(2008469)河北师范大学重点基金（L2008Z07）资助项目

Subsolidus Binary Phase Diagram of Decylammonium Tetrachlorozincate-Hexadecylammonium Tetrachlorozincate

YU Huajiang1,2, WU Kezhong2*   

  1. (1.Department of Chemistry,Cangzhou Teachers College,Cangzhou 061001,China;
    2.Department of Chemistry and Material Science,Hebei Normal University,Shijiazhuang 050016,China)
  • Received:2011-02-21 Revised:2011-04-12 Published:2012-01-10 Online:2012-01-10

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摘要：

合成了具有层状结构的热致相变材料四氯合锌酸十六铵(n-C16H33NH3)2ZnCl4,C16Zn)和四氯合锌酸十八铵(n-C18H37NH3)2ZnCl4,C18Zn)(在340~370 K的温度范围内存在着焓值较大的可逆固-固相变)。 并将此2种材料在乙醇溶液中结晶出一系列二元体系。 对二元体系利用差热分析(DTA)和X射线衍射技术进行测定，构筑了C16ZnC18Zn二元体系亚固相相图。 根据相图，确定了w(C16Zn)=41.11%处有中间化合物(n-C16H33NH3)(n-C18H37NH3)ZnCl4的存在，并测定在w(C16Zn)=16.19%和w(C16Zn)=63.07% 2处存在着2个不变的共析点，2个共析点温度分别约为356和353 K。 与同类体系的其它相图相比，在此相图的左右边界存在端际固溶体（α和β）和中间区域存在非化学计量相（γ）。

关键词: 四氯合锌酸十六烷基铵, 四氯合锌酸十八烷基铵, 相图, 差热分析, X射线衍射

Abstract:

Thermotropic layered phase transition compounds decylammonium tetrachlorozincate((n-C16H33NH3)2ZnCl4, C16Zn) and hexadecylammonium tetrachlorozincate((n-C18H37NH3)2ZnCl4,C18Zn) were synthesized, and a series of their mixtures were prepared from absolute ethanol. The compounds exhibit high enthalpy solid-solid phase transition in the temperature range of 340~370 K. Subsolidus binary phase diagram of C16ZnC18Zn was established by differential thermal analysis and X-ray diffraction. In the phase diagram, new material (nC16H33NH3)(n-C18H37NH3)ZnCl4 at w(C16Zn)=41.11% and two eutectoid invariants at w(C16Zn)=16.19% and w(C16Zn)=63.07% are observed. Two eutectic point temperatures are about 356 K and 353 K. In contrast to other similar system, there are three noticeable solid solution ranges(α, β, γ) at the left, right, and middle boundary of the phase diagram, respectively.

Key words: decylammonium tetrachlorozincate, hexadecylammonium tetrachlorozincate, Phase diagram, differential thermal analysis, X-ray diffraction

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