摘要
以磁化率测量及 Mssbauer 谱分析研究 Ge 含量对γ-Fe-Mn 合金 Néel 转变的影响。在0-8.7at-%范围内,Ge 含量增加,磁化率增大。在 T>T_N 时,合金逐渐由 Pauli 顺磁性态转变为Curie-Weiss 顺磁性态,在 T_N 点处呈现的磁化率尖峰增高,同时 Néel 转变温度(T_N)线性下降。随Ge 含量的增多,超精细场分布 P(H)的极大值朝低场方向移动,平均内场强度下降。这些结果暗示,增加 Ge 含量,促进 Fe 原子处的局域净磁矩增强,并减弱γ-Fe-Mn 合金中3d 电子的巡游特性。
The effects of Ge content(0—8.7at-%)on the Neel transition of γ-Fe-Mn alloys havebeen investigated by magnetic susceptibility(χ)measurement and M(?)ssbauer spectrum anlysis.With in-creasing Ge content,the magnetic susceptibility increases and the Neel temperature(T_N)decreases.Fortemperature above T_N,the magenetic states of the alloys transform progressively from Pauliparamagnetism to a paramagnetic state obeyed Curie-Weiss law,furthermore a sharp peak is observed atthe T_N The fitting results of Mossbauer spectra may be suggested that the maximum of hyperfine field dis-tribution P(H)shifts toward the low field and the mean value of field decreases as increasing Ge content.The results imply that the increase of Ge content has induced the itinerant character of 3d electrons inγ-Fe-Mn alloys to decrease and the localized net moment at the Fe atoms to increase.
基金
国家自然科学基金资助项目，5860252
关键词
合金
Neel转变
γ-Fe-Mn基
磁性能
Neel transition
antiferromagnetism
magnetic susceptibility
M(?)ssbauer absorption spectrum
