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

doi:10.1063/1.4769448

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

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

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 language	English (US)
Article number	231908
Journal	Applied Physics Letters
Volume	101
Issue number	23
DOIs	https://doi.org/10.1063/1.4769448
State	Published - Dec 3 2012

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4769448

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@article{0de06e998e764983bb24dc6677f988e0,

title = "Thermal conductivity of nano-grained SrTiO3 thin films",

abstract = "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.",

author = "Foley, \{Brian M.\} and Brown-Shaklee, \{Harlan J.\} and Duda, \{John C.\} and Ramez Cheaito and Gibbons, \{Brady J.\} and Doug Medlin and Ihlefeld, \{Jon F.\} and Hopkins, \{Patrick E.\}",

note = "Funding Information: The authors would like to thank Bonnie McKenzie for providing SEM images. The authors are grateful for support from the National Science Foundation Grant No. CBET 1134311 (U.V.). This work was performed in part at the Center for Atomic, Molecular, and Optical Science (CAMOS) at the University of Virginia. This work was supported, in part, by the Laboratory Directed Research and Development (LDRD) program at Sandia National Laboratories. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.",

year = "2012",

month = dec,

day = "3",

doi = "10.1063/1.4769448",

language = "English (US)",

volume = "101",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Thermal conductivity of nano-grained SrTiO3 thin films

AU - Foley, Brian M.

AU - Brown-Shaklee, Harlan J.

AU - Duda, John C.

AU - Cheaito, Ramez

AU - Gibbons, Brady J.

AU - Medlin, Doug

AU - Ihlefeld, Jon F.

AU - Hopkins, Patrick E.

N1 - Funding Information: The authors would like to thank Bonnie McKenzie for providing SEM images. The authors are grateful for support from the National Science Foundation Grant No. CBET 1134311 (U.V.). This work was performed in part at the Center for Atomic, Molecular, and Optical Science (CAMOS) at the University of Virginia. This work was supported, in part, by the Laboratory Directed Research and Development (LDRD) program at Sandia National Laboratories. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.

PY - 2012/12/3

Y1 - 2012/12/3

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/84870868526

UR - https://www.scopus.com/pages/publications/84870868526#tab=citedBy

U2 - 10.1063/1.4769448

DO - 10.1063/1.4769448

M3 - Article

AN - SCOPUS:84870868526

SN - 0003-6951

VL - 101

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 23

M1 - 231908

ER -

Thermal conductivity of nano-grained SrTiO₃ thin films

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