Breakdown of phonon glass paradigm in La- and Ce-filled Fe4Sb12 skutterudites View Full Text


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Article Info

DATE

2008-08-31

AUTHORS

Michael Marek Koza, Mark Robert Johnson, Romain Viennois, Hannu Mutka, Luc Girard, Didier Ravot

ABSTRACT

The material class of skutterudites is believed to have strong potential for thermoelectric application due to the very low thermal conductivity of the filled structures. It is generally assumed that the atoms filling the skutterudite cages act as ‘rattlers’ and essentially induce a disordered lattice dynamics referred to as ‘phonon glass’. Here, we present neutron spectroscopy experiments and ab initio computational work on phonons in LaFe4Sb12 and CeFe4Sb12. Our results give unequivocal evidence of essentially temperature-independent lattice dynamics with well-defined phase relations between guest and host dynamics, indicative of a quasi-harmonic coupling between the guests and the host lattice. These conclusions are in disagreement with the ‘phonon glass’ paradigm based on individual ‘rattling’ of the guest atoms. These findings should have an essential impact on the design and improvement of thermoelectric materials and on the development of microscopic models needed for these efforts. More... »

PAGES

805-810

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nmat2260

DOI

http://dx.doi.org/10.1038/nmat2260

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1013929138

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/18758457


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