相变贮热材料四氯合钴酸铵共析物的制备和热性能

doi:10.3866/PKU.WHXB201504163

物理化学学报 >> 2015, Vol. 31 >> Issue (7): 1260-1264.doi: 10.3866/PKU.WHXB201504163

相变贮热材料四氯合钴酸铵共析物的制备和热性能

武克忠, 孙晓龙, 陈磊, 阮北

河北师范大学化学与材料科学学院, 河北省无机纳米重点实验室, 石家庄050024

收稿日期:2015-02-12 修回日期:2015-04-15 发布日期:2015-07-08
通讯作者: 武克忠 E-mail:wukzh688@163.com
基金资助:
国家自然科学基金(21473048, 21246006)和河北省自然科学基金(B2012205034)资助项目

Preparation and Thermal Performances of 1-Alkylammonium Tetrachlorocobaltate Eutectoid Mixtures as Phase Change Materials

WU Ke-Zhong, SUN Xiao-Long, CHEN Lei, RUAN Bei

Key Laboratory of Inorganic Nano-materials of Hebei Province, Department of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, P. R. China

Received:2015-02-12 Revised:2015-04-15 Published:2015-07-08
Contact: WU Ke-Zhong E-mail:wukzh688@163.com
Supported by:
The project was supported by the National Natural Science Foundation of China (21473048, 21246006) and Natural Science Foundation of Hebei Province, China (B2012205034).

摘要/Abstract

摘要：

在温度353 K的乙醇溶液中, 采用热回流法合成了热致相变化合物四氯合钴酸铵(1-C_nH_2n+1NH₃)₂CoCl₄(n=10, 18)(分别简写为C₁₀Co、C₁₈Co)及其二元混合物. 利用差示扫描量热和X射线法对二元体系进行了表征.根据测定实验数据构筑二元相图, 所得相图结果表明, 在w_C₁₀Co=52.51% (质量分数)处存在中间化合物(1-C₁₀H₂₁NH₃)(1-C₁₈H₃₇NH₃)CoCl₄. 相图还包括两个三相线, 相对应的两个共析温度分别为(347±1)和(343±1) K, 共析点分别在w_C₁₀Co=38.50%和w_C₁₀Co=69.86%处. 并且, 在相图的左右边界存在端际固溶体(α、β)及中间区域存在非化学计量相(γ). 四氯合钴酸铵及其二元混合体系作为相变材料贮热时, 相变温度范围为340-370 K, 相变焓大小范围在2.13到141.12 J·g^-1之间.

关键词: 四氯合钴酸铵, 相变贮热材料, 差示扫描量热, 共析温度, 相图

Abstract:

The thermotropic phase-transition compounds 1-alkylammonium tetrachlorocobaltate (1-C_nH_2n+1NH₃)₂CoCl₄ (n=10, 18) and a series of their binary mixtures were prepared by solution reflux at 353 K in ethanol solutions. Binary-mixture (1-C₁₀H₂₁NH₃)₂CoCl₄-(1-C₁₈H₃₇NH₃)₂CoCl₄ systems were characterized over the entire composition range using differential scanning calorimetry and X-ray diffraction. The phase diagram constructed from the experiments indicated one stable intermediate phase, (1-C₁₀H₂₁NH₃)-(1-C₁₈H₃₇NH₃)CoCl₄, at a mass fraction w_C₁₀Co=52.51%, two invariant three-phase equilibria, and two eutectoid temperatures, which are assigned to e1 at (347±1) K, for the eutectoid point with w_C₁₀Co=38.50%, and e2 at (343±1) K, for the eutectoid point with w_C₁₀Co=69.86%. These three clear solid-solution ranges are α-phase on the left, β-phase on the right, and γ-phase in the middle of the phase diagram. The (1-C_nH_2n+1NH₃)₂CoCl₄ and their binary-mixture systems as phase change materials have phase-transition temperatures in the range 340-370 K, and transition enthalpies in the range 2.13 and 141.12 J·g^-1, between two polymorphic crystal forms.

Key words: Bis(1-alkyammonium) tetrahelometallate, Phase change materials, Differential scanning calorimetry, Eutectoid temperature, Phase diagram

武克忠, 孙晓龙, 陈磊, 阮北. 相变贮热材料四氯合钴酸铵共析物的制备和热性能[J]. 物理化学学报, 2015, 31(7), 1260-1264. doi: 10.3866/PKU.WHXB201504163

WU Ke-Zhong, SUN Xiao-Long, CHEN Lei, RUAN Bei. Preparation and Thermal Performances of 1-Alkylammonium Tetrachlorocobaltate Eutectoid Mixtures as Phase Change Materials[J]. Acta Phys. -Chim. Sin. 2015, 31(7), 1260-1264. doi: 10.3866/PKU.WHXB201504163

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201504163

https://www.whxb.pku.edu.cn/CN/Y2015/V31/I7/1260

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相变贮热材料四氯合钴酸铵共析物的制备和热性能

Preparation and Thermal Performances of 1-Alkylammonium Tetrachlorocobaltate Eutectoid Mixtures as Phase Change Materials

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