用差示扫描量热法测定金属Gd的比热容

Determination of Specific-heat Capacity of Gd by Differential Scanning Calorimetry Method

采用差示扫描量热(DSC)法测定了金属Gd的比热容,测量结果与已有文献的结果基本一致.根据德拜理论拟合比热容实验曲线确定Gd的晶格比热容,从而分离出Gd的磁比热容,得到相变点附近相对磁熵随温度的变化关系.室温附近Gd的最大磁熵变为4.7J·mol-1·K-1.

The specific-heat capacity of metal gadolinium was measured by using the differential scan- ning calorimetry （DSC） method. The results obtained from DSC method are in good agreement with the results reported in the literatures. On the basis of the Debye model,the lattice heat capacity of Gd is determined by fitting the experimental result, then the magnetic heat capacity is separated. The relationship between the relative magnetic entropy and temperature was obtained from the magnetic part of specific heat near the phase transformation point. The maximal magnetic entropy change of Gd is 4.7J·mol^-1·K^-1 near room temperature.