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Dalton Trans ; 49(1): 131-135, 2020 Jan 07.
Article in English | MEDLINE | ID: mdl-31793576

ABSTRACT

The search for tunable, size-dependent properties and unique processability has triggered the development of new synthetic routes for transition metal borides. MnB is a soft to semi-hard ferromagnetic material. This boride is now available by bottom-up, low-temperature solution chemistry. It is obtained as an unexpected metastable α'-variant that crystallises with a stacking-fault dominated CrB-type structure, as shown by transmission electron microscopy and X-ray powder diffraction (space group Cmcm, a = 300.5(8), b = 768.6(2), and c = 295.3(4) pm). The nanostructured powder consists of agglomerates of small particles (mean diameter of 85(41) nm) and transforms into well-known ß-MnB with FeB-type structure at 1523 K. The room temperature ferromagnetic behavior (TC = 545 K) is attributed to the positive exchange-correlation between the manganese atoms, that have many unpaired d electrons.

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