Jump to main content
Jump to site search

Issue 27, 2019
Previous Article Next Article

Facile p–n control, and magnetic and thermoelectric properties of chromium selenides Cr2+xSe3

Author affiliations

Abstract

Cr2Se3 crystallizes in a NiAs-type structure and is antiferromagnetic with a Néel temperature of TN = 43 K (M. Yuzuri, 1973). Here seven samples with nominal composition Cr2+xSe3 (x = −0.04, −0.02, 0, 0.04, 0.06, 0.08 and 0.12) were prepared by solid state reaction and spark plasma sintering (SPS). The phase composition was characterised by X-ray diffraction (XRD). The electrical conductivity, Seebeck coefficient, thermal conductivity, and Hall effect measurements of all compounds were performed. Both Seebeck coefficients and Hall coefficients show that Cr2+xSe3 are p-type materials when x = −0.04, −0.02, 0 and 0.04, and switch to n-type when x = 0.06, 0.08 and 0.12. An effective magnetic moment μeff = 3.85 μB per Cr ion in Cr2Se3 is obtained by the Curie–Weiss law. We also calculate and compare the band gap values of Cr2+xSe3 by various methods, such as the Arrhenius formula, the Goldsmid–Sharp equation and the optical spectrum. Moderate zT values are obtained for p-type Cr2.04Se3 and n-type Cr2.08Se3 at a relatively low temperature above room temperature. These results indicate the availability of p- and n-type legs in binary transition metal chalcogenides and reveal their potential for wide scale thermoelectric applications.

Graphical abstract: Facile p–n control, and magnetic and thermoelectric properties of chromium selenides Cr2+xSe3

Back to tab navigation

Supplementary files

Publication details

The article was received on 26 Mar 2019, accepted on 03 Jun 2019 and first published on 05 Jun 2019


Article type: Paper
DOI: 10.1039/C9TC01634A
J. Mater. Chem. C, 2019,7, 8269-8276

  •   Request permissions

    Facile p–n control, and magnetic and thermoelectric properties of chromium selenides Cr2+xSe3

    Q. Guo, D. Berthebaud, J. Ueda, S. Tanabe, A. Miyoshi, K. Maeda and T. Mori, J. Mater. Chem. C, 2019, 7, 8269
    DOI: 10.1039/C9TC01634A

Search articles by author

Spotlight

Advertisements