Low-Temperature Heat Capacity and Localized Vibrational Modes in Natural and Synthetic Tetrahedrites
Journal Article
·
· Journal of Applied Physics
- ORNL
- Michigan State University
- Michigan State University, East Lansing
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
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OSTI ID:1132354