Details

Autor(en) / Beteiligte

• Groß, H
• Dankwort, T
• Hansen, A.-L
• Schürmann, U
• Duppel, V
• Poschmann, M
• Meingast, A
• Groeneveld, D
• König, J
• Bensch, W
• Kienle, L

Titel

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

Ist Teil von

• Journal of materials chemistry. C, Materials for optical and electronic devices, 2019, Vol.7 (48), p.15188-15196

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 Cr 3 S 4 -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 . 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.