YCuTe2: A member of a new class of thermoelectric materials with CuTe4-based layered structure

Umut Aydemir*, Jan Hendrik Pöhls, Hong Zhu, Geoffroy Hautier, Saurabh Bajaj, Zachary M. Gibbs, Wei Chen, Guodong Li, Saneyuki Ohno, Danny Broberg, Stephen Dongmin Kang, Mark Asta, Gerbrand Ceder, Mary Anne White, Kristin Persson, Anubhav Jain, G. Jeffrey Snyder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Intrinsically doped samples of YCuTe2 were prepared by solid state reaction of the elements. Based on the differential scanning calorimetry and the high temperature X-ray diffraction analyses, YCuTe2 exhibits a first order phase transition at ∼440 K from a low-temperature-phase crystallizing in the space group P3m1 to a high-temperature-phase in P3. Above the phase transition temperature, partially ordered Cu atoms become completely disordered in the crystal structure. Small increases to the Cu content are observed to favour the formation of the high temperature phase. We find no indication of superionic Cu ions as for binary copper chalcogenides (e.g., Cu2Se or Cu2Te). All investigated samples exhibit very low thermal conductivities (as low as ∼0.5 W m-1 K-1 at 800 K) due to highly disordered Cu atoms. Electronic structure calculations are employed to better understand the high thermoelectric efficiency for YCuTe2. The maximum thermoelectric figure of merit, zT, is measured to be ∼0.75 at 780 K for Y0.96Cu1.08Te2, which is promising for mid-temperature thermoelectric applications.

Original languageEnglish (US)
Pages (from-to)2461-2472
Number of pages12
JournalJournal of Materials Chemistry A
Volume4
Issue number7
DOIs
StatePublished - 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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