Cubic-Tetragonal Transition and Antiferromagnetism of α'-MnZn3

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Abstract
The low temperature transition of α'-MnZn 3 alloy of Cu 3 Au type structure has been investigated by X-ray and neutron diffraction experiments, dilatometry, magnetization measurements and specific heat measurements. This alloy exhibits antiferromagnetism below 130°K, at which the cubic lattice is transformed to the tetragonal lattice, the axial ratio c / a being 0.95. On heating, both the tetragonality and sublattice magnetization vanish abruptly, indicating that this transition is of the first kind. The integrated value of the anomalous specific heat and the entropy change due to the transition are in rough agreement with those calculated by taking only the magnetic contribution into account. Apart from this transition, the field dependence of susceptibility becomes appreciable below 170°K, and the remanent magnetization appears below 60°K. These behaviours are probably due to the stacking fault in the fcc lattice, since the corresponding hcp lattice of metastable ε '-MnZn 3 is ferromagnetic.

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