Neutron Diffraction Study of γ-Phase Mn-Ir Single Crystals
Neutron Diffraction Study of γ-Phase Mn-Ir Single Crystals
复制标题
γ相Mn-Ir单晶的中子衍射研究
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
H. Takaki
中科院分区：
文献类型：
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作者：
T. Yamaoka;M. Mekata;H. Takaki
测量了无序γ相Mn 1-xIrx（x =0.128，0.170，0.204和0.256）单晶的中子衍射。衍射图案由具有四方对称性的反铁磁二子晶格结构解释。在800 K温度下测量了（110）磁反射，以确定亚晶格磁化强度和Neel温度的温度依赖性。发现对于x =0.170的合金，磁化的临界指数为0.38。Neel温度随Ir的增加而显著升高，其速率约为9 K/at% Ir，由Freeman和沃森计算的散射函数构造的磁形状因子f =（1/0.9）（f3 d-0.1f4s）可以很好地表示.随着Ir从x =0增加到x =0.204，每个Mn原子的平均磁矩从2.2μ B增加到2.6μ B。在x =0.256的合金中观察到由于Mn 3 Ir的部分原子有序引起的漫散射.
Neutron diffraction was measured on single crystals of the disordered γ-phase Mn 1- x Ir x ( x =0.128, 0.170, 0.204 and 0.256). Diffraction patterns were interpreted by an antiferromagnetic two-sublattice structure with tetragonal symmetry. The (110) magnetic reflection was measured up to about 800 K for the determination of the temperature dependence of sublattice magnetization and the Neel temperature. The critical index for magnetization was found to be 0.38 for the x =0.170 alloy. The Neel temperature increases remarkably with increasing Ir at a rate of about 9 K/at%Ir. The obtained magnetic form factors are well expressed by f =(1/0.9)( f 3d -0.1 f 4s ) constructed from the scattering functions calculated by Freeman and Watson. The average magnetic moment per Mn atom increases from 2.2µ B to 2.6µ B with increasing Ir from x =0 to x =0.204. Diffuse scattering due to partial atomic order of Mn 3 Ir was observed in the x =0.256 alloys.