Journal article
Thermoelectric figure of merit of a material with caged structure and rattler atoms
Phase transitions, v 77(1-2), pp 225-240
01 Jan 2004
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
A model is proposed to calculate the thermoelectric figure of merit of a framework crystal containing rattler atoms in cages. Such systems are expected to behave like a Phonon Glass and Electron Crystal (PGEC). The model resembles an effective Anderson model for a correlated system. The dispersion of the electronic energies and of the phonon frequencies in the system is calculated exactly. These results are used to evaluate the electronic and the thermal transport coefficients, which in turn give the temperature dependence of the thermoelectric figure of merit. Explicit calculation of the thermoelectric figure of merit for a one-dimensional case shows that the lattice thermal conductivity plays an important role in providing a peak structure to its temperature dependence. The results are presented for three different electronic dispersions and it is found that the room temperature figure of merit attains the highest value for the tight binding case. The calculation provides guidelines for designing a better thermoelectric material for use as a refrigerator.
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Details
- Title
- Thermoelectric figure of merit of a material with caged structure and rattler atoms
- Creators
- S.N. Behera - Institute of PhysicsS.M. Bose † - Department of Physics , Drexel UniversityP. Entel ‡ - Institute of Physics , University of Duisburg-EssenJ.T. Schick - Villanova University
- Publication Details
- Phase transitions, v 77(1-2), pp 225-240
- Publisher
- Taylor & Francis Group
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]
- Web of Science ID
- WOS:000188454200020
- Scopus ID
- 2-s2.0-11144255112
- Other Identifier
- 991019167690404721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Crystallography
- Physics, Condensed Matter