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Low-temperature synthesis of nanoscale ferromagnetic α′-MnB

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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 β-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.

Graphical abstract: Low-temperature synthesis of nanoscale ferromagnetic α′-MnB

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Publication details

The article was received on 28 Sep 2019, accepted on 17 Nov 2019 and first published on 03 Dec 2019


Article type: Paper
DOI: 10.1039/C9DT03842F
Dalton Trans., 2020, Advance Article

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    Low-temperature synthesis of nanoscale ferromagnetic α′-MnB

    S. Klemenz, M. Fries, M. Dürrschnabel, K. Skokov, H.-J. Kleebe, O. Gutfleisch and B. Albert, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT03842F

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