Er_2Fe_(17-x)Si_x(x=0,1,2)合金的分子场理论分析

MOLECULAR FIELD THEORY ANALYSIS OF Er_2Fe_( 17-x)Si_x(x=0,1,2) ALLOYS

用两格点分子场理论分析了合金 Er2 Fe17- x Six( x=0 ,1 ,2 )的饱和磁化强度随温度的变化关系 ,得到了分子场系数 n EE、n EF、n FF,计算了居里温度 ,给出了分子场强度 HEr( T)、HFe( T)随温度变化的曲线 .结果表明 ,当 x增加时 ,分子场系数 n FF明显增大 ,分子场强度 HFe( T)亦随之增大 ,而 HEr( T)在较低温区减小 ,在较高温区增大 ,并且 n

Through the two-sublattice molecular field theory,the temperature dependence of the saturation magnetixation of Er 2Fe 17-xSi x alloys has been analysed.The molecular field coefficients n EE,n EF and n FFare obtained and Curie temperatures of the alloys are calculated.And also the curves of the intensity of molecular field H Er(T) and H Fe(T) are plotted.The results of analysis have showed that with the increment of x,the molccular field coefficient n FF increase obviously and the increment of H Fe(T) follows as well with the decrease of H Er(T) in the range of low temperature and the increase in the range of higher temperature.The increase of n FF is the main cause of the rising of Curie temperature.