Ultra-low thermal conductivity in nanoscale layered oxides

J. Alvarez-Quintana, Ll Peralba-Garcia, J. L. Lábár, J. Rodríguez-Viejo

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The cross-plane thermal conductivity of several nanoscale layered oxides SiO2 /Y2O3, SiO2 /Cr2O3, and SiO2 /Al2O3, synthesized by e-beam evaporation was measured in the range from 30 K to 300 K by the 3ω method. Thermal conductivity attains values around 0.5 W/m K at room temperature in multilayer samples, formed by 20 bilayers of 10 nm SiO2 /10 nm Y2O3, and as low as 0.16 W/m K for a single bilayer. The reduction in thermal conductivity is related to the high interface density, which produces a strong barrier to heat transfer rather than to the changes of the intrinsic thermal conductivity due to the nanometer thickness of the layers. We show that the influence of the first few interfaces on the overall thermal resistance is higher than the subsequent ones. Annealing the multilayered samples to 1100oC slightly increases the thermal conductivity due to changes in the microstructure. These results suggest a route to obtain suitable thermal barrier coatings for high temperature applications.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Heat Transfer
Volume132
Issue number3
DOIs
Publication statusPublished - Mar 1 2010

Keywords

  • Dielectric oxides
  • Multilayers
  • Ultra-Low thermal conductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Alvarez-Quintana, J., Peralba-Garcia, L., Lábár, J. L., & Rodríguez-Viejo, J. (2010). Ultra-low thermal conductivity in nanoscale layered oxides. Journal of Heat Transfer, 132(3), 1-6. https://doi.org/10.1115/1.4000052