中文摘要：

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-CnH2n＋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wC10Co=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 J·g^-1之间.

英文摘要：

The thermotropic phase-transition compounds 1-alkylammonium tetrachlorocobaltate （1-CnH2n＋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 wC10Co=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 wC10Co=38.50%, and e2 at （343±1） K, for the eutectoid point with wC10Co=69.86%. These three clear solid-solution ranges areα-phase on the left,β-phase on the right, andγ-phase in the middle of the phase diagram. The （1-CnH2n＋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.