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Issue 48, 2019
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Purification by SPS and formation of a unique 3D nanoscale network: the showcase of Ni–Cr–S

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Abstract

The occurrence of a unique 3D nanoscale network in Ni–Cr–S, treated via spark-plasma sintering, was discovered with a variety of ex situ and in situ TEM and XRD techniques. The starting material, consisting of a heterogeneous mixture of different phases, could be purified upon application of the sintering process. The obtained samples showed a network of chemically segregated domains being either Ni rich and Cr deficient or vice versa. These domains could be proven to intergrow fully coherently in 3D, thus establishing a unique microstructure. Electron beam irradiation caused the initial Cr3S4-type structures to transform into the disordered NiAs-type. The disordering is characterised by significant short-range ordering as indicated by the appearance of prominent diffuse scattering. Thermoelectric characterisation at room temperature indicated an n-type semiconductor behaviour with thermal and electrical conductivities similar to usual thermoelectric materials, however with a low Seebeck coefficient and a low power factor of 49.3 μW m−1 K−2.

Graphical abstract: Purification by SPS and formation of a unique 3D nanoscale network: the showcase of Ni–Cr–S

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Submitted
16 Aug 2019
Accepted
12 Oct 2019
First published
16 Oct 2019

J. Mater. Chem. C, 2019,7, 15188-15196
Article type
Paper

Purification by SPS and formation of a unique 3D nanoscale network: the showcase of Ni–Cr–S

H. Groß, T. Dankwort, A.-L. Hansen, U. Schürmann, V. Duppel, M. Poschmann, A. Meingast, D. Groeneveld, J. König, W. Bensch and L. Kienle, J. Mater. Chem. C, 2019, 7, 15188
DOI: 10.1039/C9TC04548A

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