On the DO<SUB>22</SUB>-Type Alloys in the Mn-Ga System and Their Magnetic Properties

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  • Mn-Ga系におけるDO<SUB>22</SUB>型合金とその磁気特性について
  • Mn-Ga系におけるDO22型合金とその磁気特性について
  • Mn Gaケイ ニ オケル DO22ガタ ゴウキン ト ソノ ジキ トクセイ

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Crystal structures and magnetic properties of Mn-21.0∼35.0 at%Ga alloys have been investigated by means of X-ray diffraction, thermal expansion and magnetic measurements. It has been found that a metastable phase is revealed in the face-centered tetragonal DO22-type alloys in the composition range of 23.5∼31.2 at%Ga when reheated at 350∼450°C after water-quenching from the γ-Mn phase.<BR>This metastable phase has lattice parameters a of 7.09∼7.18×10−10 m and axial ratios c⁄a of 1.816∼1.840. Both of the values increase wrth Ga concentration. These DO22-type alloys in the Mn-Ga system have coercive forces greater than 3.7×105 A/m and a magnetocrystalline anisotropy constant of about 1.4×106 J/m3.

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