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Title: New insights into the structure, chemistry, and properties of Cu4SnS4

Journal Article · · Journal of Solid State Chemistry
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  1. Missouri Univ. of Science and Technology, Rolla, MO (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Cincinnati, OH (United States)
  4. Duquesne Univ., Pittsburgh, PA (United States)
  5. Univ. Gottingen (Germany)
  6. Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic). Inst. of Physics

The ambient temperature structure of Cu4SnS4 has been revisited and the recently reported low temperature structure has been confirmed from single-crystal X-ray diffraction data. A structural phase transition from a large monoclinic unit cell at low temperature to a smaller orthorhombic unit cell at high temperature has been observed. The room temperature phase exhibited disorder in the two copper sites, which is a different finding from earlier reports. The low temperature monoclinic form crystallizes in P21/c space group, which is isostructural with Cu4GeS4. The phase transition has also been studied with variable temperature powder X-ray diffraction and 119Sn Mössbauer spectroscopy. The Seebeck coefficients and electrical resistivity of polycrystalline Cu4SnS4 are reported from 16 to 400 K on hot pressed pellets. Thermal conductivity measurements at high temperatures, 350 – 750 K exhibited very low thermal conductivities in the range 0.28 – 0.35 W K–1 m–1. In all the transport measurements the phase transition has been observed at around 232 K. Resistivity decreases, while Seebeck coefficient increases after the phase transition during warming up from low to high temperatures. This change in resistivity has been correlated with the results of first-principles electronic band structure calculations using highly-accurate screened-exchange local density approximation. It was found that both the low hole effective mass of 0.63 me for the Γ→Y crystallographic direction and small band gap, 0.49 eV, are likely to contribute to the observed higher conductivity of the orthorhombic phase. Cu4SnS4 is also electrochemically active and shows reversible reaction with lithium between 1.7 and 3.5 volts.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1376545
Alternate ID(s):
OSTI ID: 1495583
Journal Information:
Journal of Solid State Chemistry, Vol. 253; ISSN 0022-4596
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (3)

Green and scalable synthesis of nanocrystalline kuramite journal January 2019
Simple one-pot synthesis of Cu 4 SnS 4 nanoplates and temperature-induced phase transformation mechanism journal January 2020
Regulation of the Crystal Structure Leading to the Bandgap Widening and Phonon Scattering Increasing in Cu 3 SnS 4 ‐Cu 3 SbSe 3 Chalcogenides journal July 2019


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