The structural and magnetic properties of Ni2Mn1-xBxGa Heusler alloys

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The influence of the substitution of manganese by boron on the crystal structure and magnetic properties of Ni2Mn1-xBxGa Heusler alloys with 0≤x≤0.5 has been investigated using X-ray diffraction, thermal expansion, resistivity, and magnetization measurements. The samples with concentrations x<0.25 were found to be of single phase and belonged to the cubic L21 crystal structure at room temperature. Crystal cell parameters of the alloys decreased from 5.830 to 5.825 Å with increasing boron concentration (x) from 0 to 0.25. The alloys were ferromagnetically ordered at 5 K and the saturation magnetization decreased with increasing boron concentration. The ferromagnetic ordering and structural transition temperatures for 0≤x≤0.3 have been observed and the phase (x-T) diagram of the Ni2Mn1-xBxGa system was constructed. The phase (x-T) diagram indicates that the ground state of Ni2Mn1-xBxGa alloys belongs to ferromagnetic martensitic, premartensitic, and austenitic phases in x≤0.12, 0.12

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Journal of Magnetism and Magnetic Materials

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