Title

A novel approach for efficient Ni nanoparticle doping of MgB2 by liquid-assisted sintering

RIS ID

106212

Publication Details

Zhao, Q., Liu, Y., Zhao, N., Penner, S. & Ma, Z. (2011). A novel approach for efficient Ni nanoparticle doping of MgB2 by liquid-assisted sintering. IEEE Transactions on Nanotechnology, 10 (2), 331-337.

Abstract

Ni nanoparticles were successfully introduced for preparing polycrystalline MgB2 samples by a novel reduction method. According to transmission electron microscopy, the obtained Ni nanoparticles with average grain size of 5 nm are distributed in the B matrix without agglomeration. The missing shift in X-ray diffraction peaks indicates that Ni nanoparticles could not substitute Mg sites in the lattice, but rather form the ternary compound MgNi 2.5B2 above 600 C. The low-melting eutectic liquid formed by MgNi at 506 C is responsible for the formation of plate-like MgB2 grains and the fast fabrication of MgB2 at low temperature. The sample doped with nano-Ni has better grain connectivity and the critical current density (Jc) with respect to the commercial Ni-doped sample, but there is no improvement compare with the pure MgB2 sample. A sintering model was accounted for understanding the reaction between Mg and B with the assistance of Ni nanoparticles. 2006 IEEE.

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Link to publisher version (DOI)

http://dx.doi.org/10.1109/TNANO.2010.2041247