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In-field heat treatments of an MnGa diffusion couple were performed at 773K for 12, 24 and 48 h to investigate the phase formation under magnetic fields. Formation of the MnGa3,… Click to show full abstract
In-field heat treatments of an MnGa diffusion couple were performed at 773K for 12, 24 and 48 h to investigate the phase formation under magnetic fields. Formation of the MnGa3, Mn2Ga5, MnGa, Mn3Ga2 and ¢-Mn phases was confirmed for magnetic fields of 0T and 5T. For a diffusion-controlled process, there is a parabolic relationship between the thickness of the phase layers and annealing time for the MnGa and Mn2Ga5 phases. The parabolic coefficients of MnGa and Mn2Ga5 for a zero magnetic field were determined as 8.7 © 1013 μm2s11 and 4.6 © 1011 μm2s11 respectively. For a magnetic field of 5 T, the parabolic coefficients were evaluated as 11 © 1013 μm2s11 for the MnGa phase and 4.5 © 1011 μm2s11 for the Mn2Ga5 phase. [doi:10.2320/matertrans.MT-MAW2019013]
Journal Title: MATERIALS TRANSACTIONS
Year Published: 2019
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