Abstract
B27-Bfphase transition of MnB compound is realized in mechanical milling for 7.2 × l04s. Two conditions have been found to be essential for the transition, which are the nanostructure of B27 crystalline MnB and higher lattice strain in the grains. The formation of Bf phase is considered to be shear induced, with little alteration in the B-B and Fe-Fe atomic spacings. The magnetization shows no sharp changes between the Bfphase and the milled B27 phase, but coercivity is reduced substantially because of the much expense of lattice strains in the transformation.
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