Journal
JOURNAL OF APPLIED PHYSICS
Volume 115, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4878676
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Funding
- Center on Revolutionary Materials for Solid State Energy Conversion, an Energy Frontier Research Center - U. S. Department of Energy, Office of Basic Energy Sciences [DE-SC0001054]
- U. S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
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The heat capacity of natural (Cu12-x (Fe, Zn, Ag) x(Sb, As)(4)S-13) and synthetic (Cu12-xZnxSb4S13 with x = 0, 1, 2) tetrahedrite compounds was measured between 2K and 380 K. 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 similar to 1.0 meV, similar to 2.8 meV, and similar to 8.4 meV. The existence of localized vibrational 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. (C) 2014 AIP Publishing LLC.
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