Tuning the magnetic and structural properties of a three-metal boride alloy: Mn0.95-δFe1.05+δ-xCoxB

JOURNAL OF ALLOYS AND COMPOUNDS

卷:805

Article

Abramchuk, Mykola¹  Mier, Thomas¹  Tafti, Fazel¹ 

[1] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

关键词: boride;    Alloys;    Crystallography;    Magnetism;    Magnetocaloric;   

DOI  :  10.1016/j.jallcom.2019.07.119

来源: Elsevier

【 摘 要 】

We present a comprehensive study of the three-metal boride alloys Mn0.95-delta Fe1.05 + delta-xCoxB (delta = 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 T-c and the saturated magnetization M-s as a function of x. These findings highlight the tunable nature of Mn-0.95-delta Fe-1.05 + delta-xCoxB and motivate further studies of metal-rich boride alloys. (C) 2019 Elsevier B.V. All rights reserved.

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