Thermoelectric Properties of Minerals with the Mawsonite Structure

Ilaria Siloi, Priya Gopal, Stefano Curtarolo, Marco Buongiorno Nardelli, Paz Vaqueiro, Marco Fornari

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Synthetic copper sulfides have emerged as promising nontoxic and low-cost materials for thermoelectric power generation in low-grade waste heat recovery systems. Similarly to tetrahedrite and colusite, mawsonite Cu6Fe2SnS8 exhibits a modified corner sharing Cu-S tetrahedral network which usually leads to p-type character and low thermal conductivity. In order to explore the applicative potential of mawsonite, we studied the band structure, the phonon dispersions, the electronic and transport coefficients, as well as the effect of isovalent substitutions of Fe, Sn, and S. The combined analysis of electronic and vibrational properties highlights the role of the weakly bonded copper component in achieving a very low thermal conductivity. We also demonstrate that the Cu-S bond builds a 2D conductive network where the contribution from other elements is negligible. Magnetic calculations point to an antiferromagnetic ground state substantially affected by the covalency of the bonds with the conductive plane. The chemical substitution of Fe with Ni leads to nonmagnetic metals whereas Cu6Fe2SnSe8, Cu6Fe2PbS8, and Cu6Fe2GeX8 with X = S, Se, and Te are semiconductors.

Original languageEnglish
Pages (from-to)8068-8078
Number of pages11
JournalACS Applied Energy Materials
Volume2
Issue number11
DOIs
StatePublished - Nov 25 2019

Keywords

  • density functional theory
  • minerals
  • phonons
  • sulfides
  • thermoelectricity

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