Abstract
The binary manganese-antimony (Mn-Sb) phase diagram was reinvestigated in the whole composition range using powder-XRD, DTA and SEM-EDX. The phase boundaries and melting temperatures of the ferromagnetic phases MnSb and Mn2Sb were modified by taking into account the new experimental data. Most of the reaction temperatures could be verified within a range of ±10 °C. Nevertheless, a few temperatures had to be revised, such as the eutectic reaction L → β-Mn + Mn 2 Sb at 893 °C and the eutectoid reaction β-Mn → α-Mn + Mn 2 Sb at 718 °C. The previously reported peritectic melting behavior of MnSb could be confirmed. The variation of the lattice parameters of the NiAs-(B8 1 ) type MnSb phase with composition was determined. A revised version of the of the Mn-Sb phase diagram is presented.
Highlights
Binary intermetallic phases based on 3d metals and group 15 elements like MnSb, MnBi, Mn2Sb are interesting technical materials
Several studies on phase composition, crystal structure, and magnetic properties of MnSb and Mn2Sb can be found in the literature, both at normal[9,10,11,12,13] as well as at high pressures,[14,15,16,17] only a few experimental studies were published on the whole binary Mn-Sb system since the first investigation by Williams.[10]
Even though the published phase diagram was based on experimental data from several authors[9,10,11,12,20,21] there were many uncertainties remaining, in particular with respect to the phase boundaries of solid phases: the exact stability range of Mn2Sb and MnSb was not known
Summary
Binary intermetallic phases based on 3d metals and group 15 elements like MnSb, MnBi, Mn2Sb are interesting technical materials. Phases with the NiAs structure, such as MnSb, crystallize in the hexagonal space group P63/mmc. This structure type is characterized by atoms of a main group element B (Sb), forming a hexagonal closed packed lattice on Wyckoff position 2c (1/3, 2/3, 1/4) with the octahedral sites being occupied by transition metal atoms T (Mn), on Wyckoff position 2a (0,0,0).
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