Thermal conductivity of nano-grained SrTiO3 thin films

Brian M. Foley, Harlan J. Brown-Shaklee, John C. Duda, Ramez Cheaito, Brady J. Gibbons, Doug Medlin, Jon F. Ihlefeld, Patrick E. Hopkins

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


We measure the thermal conductivities of nano-grained strontium titanate (ng- SrTiO3) films deposited on sapphire substrates via time-domain thermoreflectance. The 170 nm thick oxide films of varying grain-size were prepared from a chemical solution deposition process. We find that the thermal conductivity of ng- SrTiO3 decreases with decreasing average grain size and attribute this to increased phonon scattering at grain boundaries. Our data are well described by a model that accounts for the spectral nature of anharmonic Umklapp scattering along with grain boundary scattering and scattering due to the film thickness.

Original languageEnglish (US)
Article number231908
JournalApplied Physics Letters
Issue number23
StatePublished - Dec 3 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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