磁熵变与居里温度的测量

Magnetic Entropy Change and Measurement of Curie Temperature

用M -T曲线测量居里温度时 ,由于热电偶的“延迟”效应使测量结果存在较大误差。根据热力学理论可知 ,磁性材料在居里点具有最大磁熵变 ,因此可由△SM -T曲线的峰值确定居里点TC。这种方法由于测量过程是恒温的 ,因而完全避免了“延迟”效应所产生的误差。

Deferment effect is the main facter that causes the measurement error when determine the Curie temperature by M-T curve.According to the themomechanics theory,magnetic entropy change △S M of the magnetic materials has the peak value at Curie temperature,this enable us to determine the Curie point by the peak value of △S M-T curve.This experiment method can entirely avoid the measurement error caused by the deferment effect due to the constant temperature of the measurement process.