Thermal conductivity of nano-grained SrTiO3 thin films

被引:54
作者
Foley, Brian M. [1 ]
Brown-Shaklee, Harlan J. [2 ]
Duda, John C. [1 ,2 ]
Cheaito, Ramez [1 ]
Gibbons, Brady J. [3 ]
Medlin, Doug [4 ]
Ihlefeld, Jon F. [2 ]
Hopkins, Patrick E. [1 ]
机构
[1] Univ Virginia, Dept Mech & Aerosp Engn, Charlottesville, VA 22904 USA
[2] Sandia Natl Labs, Albuquerque, NM 87185 USA
[3] Oregon State Univ, Sch Mech Ind & Mfg Engn, Corvallis, OR 97331 USA
[4] Sandia Natl Labs, Livermore, CA 94550 USA
基金
美国国家科学基金会;
关键词
PICOSECOND LIGHT-PULSES; THERMOELECTRIC-MATERIALS; GENERATION; BATIO3; HEAT;
D O I
10.1063/1.4769448
中图分类号
O59 [应用物理学];
学科分类号
摘要
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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4769448]
引用
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页数:4
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