Synthesis, magnetic and transport properties of oxygen-free CrN ceramics

0438771 - FZÚ 2017 RIV GB eng J - Journal Article
Jankovský, O. - Sedmidubský, D. - Huber, Štěpán - Šimek, P. - Šofer, Z.
Synthesis, magnetic and transport properties of oxygen-free CrN ceramics.
Journal of the European Ceramic Society. Roč. 34, č. 16 (2014), s. 4131-4136. ISSN 0955-2219. E-ISSN 1873-619X
R&D Projects: GA ČR GA13-20507S
Institutional support: RVO:68378271
Keywords : chromium nitride * nitride ceramics * magnetotransport properties * thermoelectric properties
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.947, year: 2014

In the literature, CrN is usually synthetized as thin films and often contains impurities such as oxygen or Cr2N. We successfully prepared pure CrNpowder by ammonolysis of anhydrous chromium (III) chloride, which was confirmed by X-ray diffraction analysis (XRD) and SEM-EDS. CrNceramics were then prepared by classical ceramic route (CCR) and by spark plasma sintering (SPS) at different sintering conditions. Transportproperties (Seebeck coefficient, electrical resistivity and thermal conductivity) were measured in the range 2–600 K and the magnetic behaviorwas examined by SQUID. Above the room temperature thermal conductivity was obtained by laser flash analysis (LFA). Thermal stability andthermodynamic characteristics were probed by simultaneous thermal analysis (STA). Transport properties are strongly affected by the fabricationprocess and the resulting figure of merit (ZT) is surprisingly high.
Permanent Link: http://hdl.handle.net/11104/0270618