Potential of Chevrel phases for thermoelectric applications |
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| Institution: | 1. Department of Chemistry and Industrial Chemistry - University of Genova, Via Dodecaneso 31, 16146 Genova, Italy;2. CNR-ICMATE, Via De Marini 6, 16149 Genova, Italy;3. CNR-ICMATE, Via Previati 1/E, 23900 Lecco, Italy;4. INSTM - Interuniversitary Consortium of Science and Technology of Materials, Genova Research Unit, Via Dodecaneso 31, 16146 Genova, Italy;5. CNR-SPIN Genova, Corso Perrone 24, 16152 Genova, Italy;1. School of Materials Science and Engineering, Ningbo University of Technology, Cuibai Road 89, 315016 Ningbo, China;2. School of Materials Science and Engineering, Beihang University, 100191 Beijing, China;1. AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Silicate Chemistry and Macromolecular Compounds, Al. Mickiewicza 30, 30-059 Krakow, Poland;2. AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Inorganic Chemistry, Thermoelectric Research Laboratory, Al. Mickiewicza 30, 30-059 Krakow, Poland;1. Department of Mechanical Engineering – Rabigh, King Abdulaziz University, Jeddah, Saudi Arabia;2. Department of Mechanical and Aerospace Engineering, Western Michigan University, Kalamazoo, MI 49008-5343, USA;3. Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA |
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| Abstract: | A low lattice thermal conductivity is one of the requirements to achieve high thermoelectric figures of merit. Several low thermal conductivity materials were identified and developed over the past few years at the Jet Propulsion Laboratory (JPL), including filled skutterudites and Zn4Sb3-based materials. A study of the mechanisms responsible for the high phonon scattering rates in these compounds has demonstrated that materials with structures that can accommodate additional atoms in their lattice are likely to possess low lattice thermal conductivity values. Chevrel phases (Mo6Se8-type) are just such materials and are currently being investigated at JPL for thermoelectric applications. The crystal structures of the Chevrel phases present cavities which can greatly vary in size and can contain a large variety of atoms ranging from large ones such as Pb to small ones such as Cu. In these materials, small inserted atoms usually show large thermal parameters which indicate that they move around and can significantly scatter the phonons. The electronic and thermal properties of these materials can potentially be controlled by a careful selection of the filling element(s). We have synthesized (Cu, Cu/Fe, Ti)xMo6Se8 samples and report in this paper on their thermoelectric properties. Approaches to optimize the properties of these materials for thermoelectric applications are discussed. Solid State Sciences, 1293-2558/99/7-8/© 1999 Éditions scientifiques et médicales Elsevier SAS. All rights reserved. |
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