Effects of Nb substitution on thermoelectric properties of CrSi2

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Abstract

The effects of Nb substitution on the solubility range, lattice parameters, and thermoelectric properties of CrSi2with a C40-type structure have been investigated. Polycrystalline samples of Nb-substituted Cr1-xNbxSi2(0 ≤ x ≤ 0.15) have been prepared by a two-step arc-melting process, followed by spark plasma sintering. XRD patterns confirm that single-phase Cr1-xNbxSi2is obtained in the composition range 0 ≤ x ≤ 0.10. As x increases from 0 to 0.10, the a- and c-axis lengths increase linearly. For x > 0.10, the a- and c-axis lengths do not obey Vegard's rule. The electrical conductivity of Cr1-xNbxSi2(0 ≤ x ≤ 0.10) increases with increasing x, although the Seebeck coefficient gradually decreases with increasing x over the entire temperature range. In addition, the total thermal conductivity decreases with increasing x, owing to the reduction in lattice thermal conductivity. As a consequence, the dimensionless figure-of-merit ZTmaxincreases from 0.16 (x = 0) at 600 K to 0.20 (x = 0.05) at 700 K.

Original languageEnglish
Pages (from-to)37-41
Number of pages5
JournalJournal of Alloys and Compounds
Volume687
DOIs
Publication statusPublished - 2016 Jan 1

Keywords

  • Carrier concentration
  • Nb substitution
  • Thermal conductivity
  • Thermoelectric properties

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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