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

DOI: 10.1039/C9TC04548A DOI Help

Authors: H. Groß (Kiel University) , T. Dankwort (Kiel University) , A.-L. Hansen (Kiel University) , U. Schürmann (Kiel University) , V. Duppel (Max Planck Institute for Solid State Research) , M. Poschmann (Kiel University) , A. Meingast (Thermo Fisher Scientific) , D. Groeneveld (University of Freiburg) , J. König (University of Freiburg; Fraunhofer Institute for Physical Measurement Techniques IPM) , W. Bensch (Kiel University) , L. Kienle (Kiel University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry C , VOL 19

State: Published (Approved)
Published: October 2019

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.

Subject Areas: Materials, Chemistry

Instruments: I15-Extreme Conditions

Other Facilities: DESY

Added On: 08/11/2019 10:51

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Physical Chemistry Earth Sciences & Environment Climate Change Energy Sustainable Energy Systems Materials Science Quantum Materials Thermoelectrics Chemistry

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