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Low thermal conductivity of the negative thermal expansion material, HfMo2O8

dc.contributor.authorKennedy, Catherine A.en_US
dc.contributor.authorWhite, Mary Anneen_US
dc.contributor.authorWilkinson, Angus P.en_US
dc.contributor.authorVarga, Tamasen_US
dc.date.accessioned2013-08-23T15:58:40Z
dc.date.available2013-08-23T15:58:40Z
dc.date.issued2007-04en_US
dc.description.abstractThe thermal conductivity of the cubic polymorph of hafnium molybdate, HfMo2O8, was determined over the temperature range of 2-400 K. The values of thermal conductivity were low (0.64 +/- 0.15 W m(-1) K-1 at T=300 K for a fully dense sample), with a positive temperature coefficient throughout the temperature range examined. Calculations of the theoretical minimum thermal conductivity and the effective phonon mean free path show that the heat-carrying phonons are nearly fully coupled in HfMo2O8, consistent with the rather large magnitude of its Gruneisen parameter. The low-frequency optic modes which lead to negative thermal expansion in HfMo2O8 are likely responsible for the low thermal conductivity. (c) 2007 American Institute of Physics.en_US
dc.identifier.citationKennedy, Catherine A., Mary Anne White, Angus P. Wilkinson, and Tamas Varga. 2007. "Low thermal conductivity of the negative thermal expansion material, HfMo2O8." Applied Physics Letters 90(15): 151906-151906.en_US
dc.identifier.issn0003-6951en_US
dc.identifier.issue15en_US
dc.identifier.startpage151906en_US
dc.identifier.urihttp://dx.doi.org/10.1063/1.2721860en_US
dc.identifier.urihttp://hdl.handle.net/10222/36167
dc.identifier.volume90en_US
dc.relation.ispartofApplied Physics Lettersen_US
dc.titleLow thermal conductivity of the negative thermal expansion material, HfMo2O8en_US
dc.typearticleen_US

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