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化学学报
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化学学报 ›› 1988, Vol. 46 ›› Issue (3): 281-284. 上一篇    下一篇

研究论文

四氯合金属(II)酸正烷铵在280-500K间的热力学性质和相变 II: 四氯合锌(II)酸正十二烷铵

张志英;杨孟林   

  1. 西北大学热化学研究室
  • 发布日期:1988-03-15

Thermodynamic properties and phase transitions of alkylammonium tetrachlorometallates(II) between 280 and 500K II: Dodecylammonium tetrachlorozincate(II)

ZHANG ZHIYING;YANG MENGLIN   

  • Published:1988-03-15

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研究了四氯合锌(II)酸正十二烷铵(C12H25NH3)2ZnCl4(1)]在280-500K间的热力学性质和相变热参数. 据报导(RNH3)MX4型化合物在300-380K间有相变焓很大的固-固相变, 是很有开发前景的固-固相变低温储能材料, 本文为(1)的应用提供了精确的热数据.

关键词: 铵化合物, 热力学性质, 相变, 熵, 焓, 量热法, 比热, 十二碳化合物, 氯化锌, 绝热

The heat capacity of (n-C12H25NH3)2ZnCl4 was measured at 280-500 K by means of an automatic adiabatic calorimeter. Two phase transitions, one solid-solid and the other solid-liq., were found at 364.3 ?0.1 and 435.1 ?0.1 K resp. The enthalpies and entropies of these transitions are 66.79 ?0.35 kJ/mol and 183.3 ?11.0 J/K mol for the solid-solid transitions, and 9.12 ?0.14 kJ/mol and 20.96 ?0.32 J/K.mol for the solid-liq. transition, resp. The selected thermodn. properties are tabulated in 10 K interval from 280 to 500 K.

Key words: AMMONIUM COMPOUND, THERMODYNAMIC PROPERTIES, PHASE TRANSFORMATION, ENTROPY, ENTHALPY, CALORIMETRY, SPECIFIC HEAT, C12 COMPOUNDS, ZINC CHLORIDE, THERMAL INSULATION

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