Mossbauer and Structural Studies on (Fe_<1_x>Mn_x)_2B
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Mossbauer effect, lattice parameter and thermal expansion measurements were performed in order to obtain the information about the sharp decrease of magnetic moment in (Fe_<1-x>Mn_x)_2B with increasing x. The internal field at 0 K (H_0) decreases slightly with the increase of x in the composition range x<___-0.33 at a rate of dH_0/dx∼-135 kOe. When x becomes larger than 0.33 the slope becomes steeper, dH_0/dx∼-450 kOe. These experimental results were explained well by the assumption that the magnetic moment associated with iron atom becomes 0 μ_B when iron atoms have more than 7 manganese atoms in its near neighbors. The lattice parameter of a-axis at room temperature varies linearly with composition. On the other hand, in c-axis the lattice-parameter-composition curve shows a kink at x=0.63. No thermal expansion anomaly is observed. This behavior indicates that the magnetic term of lattice parameter remains unchanged even above the Curie temperature.
- 社団法人日本物理学会の論文
- 1975-11-15
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