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Thermal conductivity of nano-grained SrTiO3 thin films Public Deposited

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https://ir.library.oregonstate.edu/concern/articles/7m01bm27g

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  • 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.
  • Keywords: thin films, time-domain reflectometry, grain boundaries, grain size, phonon-phonon interactions, strontium compounds, thermoreflectance, anharmonic lattice modes nanostructured materials electron-phonon interactions liquid phase deposition nanofabrication thermal conductivity
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  • Brian M. Foley, Harlan J. Brown-Shaklee, John C. Duda, Ramez Cheaito, Brady J. Gibbons et al., Thermal conductivity of nano-grained SrTiO₃ thin films, Applied Physics Letters, 101, 231908 (2012); doi: 10.1063/1.4769448
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  • 101
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  • 23
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  • The authors are grateful for supportfrom the National Science Foundation Grant No. CBET1134311 (U.V.). This work was performed in part at the Centerfor Atomic, Molecular, and Optical Science (CAMOS) atthe University of Virginia. This work was supported, in part,by the Laboratory Directed Research and Development(LDRD) program at Sandia National Laboratories. SandiaNational Laboratories is a multi-program laboratory managedand operated by Sandia Corporation, a wholly ownedsubsidiary of Lockheed Martin Corporation, for the U.S.Department of Energy’s National Nuclear Security Administrationunder contract DE-AC04-94AL85000.
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2013-01-17T22:59:54Z No. of bitstreams: 1 GibbonsBradyMIMEThermalConductivityNano.pdf: 456309 bytes, checksum: d947bbef127d817ce4a05810ff81f5b6 (MD5)
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  • description.provenance : Approved for entry into archive by Deanne Bruner(deanne.bruner@oregonstate.edu) on 2013-01-18T00:34:19Z (GMT) No. of bitstreams: 1 GibbonsBradyMIMEThermalConductivityNano.pdf: 456309 bytes, checksum: d947bbef127d817ce4a05810ff81f5b6 (MD5)

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