Thermal Conductivity of the Rare-Earth Strontium Aluminates
2010 Wan Thermal Conductivity of Rare-Earth Strontium Aluminates.pdf (402.5Kb)
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CitationWan, Chunlei, Taylor D. Sparks, Pan Wei, David R. Clarke. 2010. Thermal conductivity of the rare-earth strontium aluminates. Journal of the American Ceramic Society 93(5): 1457-1460.
AbstractThe thermal conductivity of a series of complex aluminates, RE2SrAl2O7, with different rare-earth (RE) ions, has been measured up to 1000°C. There is a strong dependence on the atomic number of the RE ion, ranging from an approximately 1/T dependence for the lanthanum strontium aluminate to an almost temperature-independent behavior of the dysprosium strontium aluminate. The latter conductivity is comparable with that of yttria-stabilized zirconia, the current material of choice for thermal barrier coatings. The temperature dependence of the thermal conductivities of all the aluminates studied can be fit to a standard phonon–phonon scattering model, modified to account for a minimum phonon mean free path, in which the difference in behavior is attributed to increased phonon–phonon scattering with the atomic mass of the RE ion. Although a satisfactory parametric fit is obtained, the model does not take into account either the detailed layer structure of the aluminates, consisting of alternating rock-salt and perovskite layers in a natural superlattice structure, or the site preferences of the RE ion. This suggests that further model development is warranted.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:11077825
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