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Title: Low-Temperature Heat Capacity and Localized Vibrational Modes in Natural and Synthetic Tetrahedrites

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4878676· OSTI ID:1132354

The heat capacity of natural (Cu12-x (Fe, Zn, Ag)x(Sb, As)4S13) and synthetic (Cu12-xZnxSb4S13 with x=0, 1, 2) tetrahedrite compounds was measured between 2K and 380K. It was found that the temperature dependence of the heat capacity can be described using a Debye term and three Einstein oscillators with characteristic temperatures that correspond to energies of ~1.0 meV, ~2.8 meV and ~8.4 meV. The existence of localized vibration modes, which are assigned to the displacements of the trigonally coordinated Cu atoms in the structure, is discussed in the context of anharmonicity and its effect on the low lattice thermal conductivity exhibited by these compounds.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
DE-AC05-00OR22725
OSTI ID:
1132354
Journal Information:
Journal of Applied Physics, Vol. 115, Issue 19; ISSN 0021-8979
Country of Publication:
United States
Language:
English

References (7)

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High Performance Thermoelectricity in Earth-Abundant Compounds Based on Natural Mineral Tetrahedrites journal October 2012
High-performance thermoelectric mineral Cu 12− x Ni x Sb 4 S 13 tetrahedrite journal January 2013
Role of Lone-Pair Electrons in Producing Minimum Thermal Conductivity in Nitrogen-Group Chalcogenide Compounds journal November 2011
The distribution of Cu(II) and the magnetic properties of the synthetic analogue of tetrahedrite: Cu12Sb4S13 journal May 2005
Localized vibrational modes in metallic solids journal October 1998
Avoided crossing of rattler modes in thermoelectric materials journal August 2008

Cited By (16)

From Bonding Asymmetry to Anharmonic Rattling in Cu 12 Sb 4 S 13 Tetrahedrites: When Lone-Pair Electrons Are Not So Lonely journal May 2015
An Integrated Approach to Thermoelectrics: Combining Phonon Dynamics, Nanoengineering, Novel Materials Development, Module Fabrication, and Metrology journal July 2018
High-Temperature Transport Properties of Colusite Cu24 T 2V2Ge6S32 (T = Ni, Co) journal September 2016
Thermoelectric Properties of Magnesium-Doped Tetrahedrite Cu12−xMgxSb4S13 journal February 2019
From crystal to glass-like thermal conductivity in crystalline minerals journal January 2015
On the microscopic dynamics of the ‘Einstein solids’ AlV 2 Al 20 and GaV 2 Al 20 , and of YV 2 Al 20 : a benchmark system for ‘rattling’ excitations journal January 2015
Tetrahedrites as thermoelectric materials: an overview journal January 2015
Structural analysis and thermoelectric properties of mechanically alloyed colusites journal January 2016
Powder metallurgically synthesized Cu 12 Sb 4 S 13 tetrahedrites: phase transition and high thermoelectricity journal January 2017
Promoted high temperature carrier mobility and thermoelectric performance of InTe enabled by altering scattering mechanism journal January 2019
High-performance thermoelectric minerals: Colusites Cu 26 V 2 M 6 S 32 (M = Ge, Sn) journal September 2014
Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures journal October 2016
Recent developments in Earth-abundant copper-sulfide thermoelectric materials journal September 2019
Structural phase transition and phonon instability in Cu 12 Sb 4 S 13 journal February 2016
Thermoelectric Materials: A New Rapid Synthesis Process for Nontoxic and High-Performance Tetrahedrite Compounds journal October 2015
Phase Diagram Study in n-CoSb3 Skutterudites book November 2016

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