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  4. Purification by SPS and formation of a unique 3D nanoscale network: The showcase of Ni-Cr-S
 
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2019
Journal Article
Title

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

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 mW m-1 K-2.
Author(s)
Groß, Hendrik
Dankwort, Torben  
Hansen, Anna-Lena
Schürmann, Ulrich
Düppel, Viola
Poschmann, Michael
Meingast, Arno
Groeneveld, Dennis
König, Jan D.  
Bensch, Wolfgang
Kienle, Lorenz
Journal
Journal of materials chemistry. C, Materials for optical and electronic devices  
DOI
10.1039/c9tc04548a
Language
English
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Keyword(s)
  • thermoelectricity

  • spark plasma sintering

  • thermal conductivity

  • electrical conductivity

  • seebeck coefficient

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