Abstract
We present a comprehensive study of the three-metal boride alloys Mn0.95−δFe1.05 + δ−xCoxB (δ=0−0.15 and x=0−1.05) synthesized via arc melting and annealing. The alloys crystallize in a body-centered tetragonal unit cell in the same space group (I4/mcm) as the parent compound Mn2B. A small amount of MB (M = Mn, Fe, Co) impurity forms in the as-cast samples which is removed by acid treatment. Rietveld refinement on the powder X-ray data reveals an anisotropic variation of lattice parameters in the series. The c-axis increases with increasing Co content but the a-axis decreases. Magnetic measurements show a non-monotonic variation of both Tc and the saturated magnetization Ms as a function of x. These findings highlight the tunable nature of Mn0.95−δFe1.05 + δ−xCoxB and motivate further studies of metal-rich boride alloys.
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