论文部分内容阅读
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-CnH2n+1NH3)2Co Cl4(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wC10Co=52.51%(质量分数)处存在中间化合物(1-C10H21NH3)(1-C18H37NH3)Co Cl4.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wC10Co=38.50%和wC10Co=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 Jg-1之间.
(1-CnH2n + 1NH3) 2Co Cl4 (n = 10,18) (abbreviated as C10Co, C18Co) were synthesized by thermal reflux method in ethanol solution with a temperature of 353 K, And their binary mixtures.The binary system was characterized by differential scanning calorimetry and X-ray diffraction.The binary phase diagram was constructed based on the experimental data and the results of the phase diagram showed that at wC10Co = 52.51% (mass fraction) There are intermediate compounds (1-C10H21NH3) (1-C18H37NH3) Co Cl4. The phase diagram also includes two three-phase lines with corresponding eutectoid temperatures of (347 ± 1) and The analysis points were at wC10Co = 38.50% and wC10Co = 69.86%, respectively, and the presence of non-stoichiometric phase (γ) at the left and right boundaries of the phase diagram and the non-stoichiometric phase (γ) And its binary system as a phase change material, the phase transformation temperature range is 340-370 K and the enthalpy of phase transition ranges from 2.13 to 141.12 Jg-1.