Glass-Like Thermal Conductivity of (010)-Textured Lanthanum-Doped Strontium Niobate Synthesized with Wet Chemical Deposition

Foley, Brian M.; Brown-Shaklee, Harlan J.; Campion, Michael J.; Medlin, Douglas L.; Clem, Paul G.; Ihlefeld, Jon F.; Hopkins, Patrick E.

doi:10.1111/jace.13318

Title: Glass-Like Thermal Conductivity of (010)-Textured Lanthanum-Doped Strontium Niobate Synthesized with Wet Chemical Deposition

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Abstract

We have measured the cross-plane thermal conductivity (κ) of (010)-textured, undoped, and lanthanum-doped strontium niobate (Sr_2-xLa_xNb₂O_7-δ) thin films via time-domain thermoreflectance. Then the thin films were deposited on (001)-oriented SrTiO₃ substrates via the highly-scalable technique of chemical solution deposition. We find that both film thickness and lanthanum doping have little effect on κ, suggesting that there is a more dominant phonon scattering mechanism present in the system; namely the weak interlayer-bonding along the b-axis in the Sr₂Nb₂O₇ parent structure. We also compare our experimental results with two variations of the minimum-limit model for κ and discuss the nature of transport in material systems with weakly-bonded layers. The low cross-plane κ of these scalably-fabricated films is comparable to that of similarly layered niobate structures grown epitaxially.

Authors:

Foley, Brian M. ^[1]; Brown-Shaklee, Harlan J. ^[2]; Campion, Michael J. ^[2]; Medlin, Douglas L. ^[3]; Clem, Paul G. ^[2]; Ihlefeld, Jon F. ^[2]; Hopkins, Patrick E. ^[1]

Univ. of Virginia, Charlottesville, VA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Publication Date:: Sat Nov 08 00:00:00 EST 2014

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1111302

Report Number(s):: SAND-2013-7932J
Journal ID: ISSN 0002-7820; 474313

Grant/Contract Number:: AC04-94AL85000

Resource Type:: Accepted Manuscript

Journal Name:: Journal of the American Ceramic Society

Additional Journal Information:: Journal Volume: 98; Journal Issue: 2; Journal ID: ISSN 0002-7820

Publisher:: American Ceramic Society

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Foley, Brian M., Brown-Shaklee, Harlan J., Campion, Michael J., Medlin, Douglas L., Clem, Paul G., Ihlefeld, Jon F., and Hopkins, Patrick E. Glass-Like Thermal Conductivity of (010)-Textured Lanthanum-Doped Strontium Niobate Synthesized with Wet Chemical Deposition.  United States: N. p., 2014. 
Web.  doi:10.1111/jace.13318.

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                    Foley, Brian M., Brown-Shaklee, Harlan J., Campion, Michael J., Medlin, Douglas L., Clem, Paul G., Ihlefeld, Jon F., & Hopkins, Patrick E. Glass-Like Thermal Conductivity of (010)-Textured Lanthanum-Doped Strontium Niobate Synthesized with Wet Chemical Deposition.  United States.  https://doi.org/10.1111/jace.13318

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                    Foley, Brian M., Brown-Shaklee, Harlan J., Campion, Michael J., Medlin, Douglas L., Clem, Paul G., Ihlefeld, Jon F., and Hopkins, Patrick E. Sat .  
"Glass-Like Thermal Conductivity of (010)-Textured Lanthanum-Doped Strontium Niobate Synthesized with Wet Chemical Deposition".  United States.  https://doi.org/10.1111/jace.13318.  https://www.osti.gov/servlets/purl/1111302.

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@article{osti_1111302,

  title        = {Glass-Like Thermal Conductivity of (010)-Textured Lanthanum-Doped Strontium Niobate Synthesized with Wet Chemical Deposition},

  author       = {Foley, Brian M. and Brown-Shaklee, Harlan J. and Campion, Michael J. and Medlin, Douglas L. and Clem, Paul G. and Ihlefeld, Jon F. and Hopkins, Patrick E.},

  abstractNote = {We have measured the cross-plane thermal conductivity (κ) of (010)-textured, undoped, and lanthanum-doped strontium niobate (Sr2-xLaxNb2O7-δ) thin films via time-domain thermoreflectance. Then the thin films were deposited on (001)-oriented SrTiO3 substrates via the highly-scalable technique of chemical solution deposition. We find that both film thickness and lanthanum doping have little effect on κ, suggesting that there is a more dominant phonon scattering mechanism present in the system; namely the weak interlayer-bonding along the b-axis in the Sr2Nb2O7 parent structure. We also compare our experimental results with two variations of the minimum-limit model for κ and discuss the nature of transport in material systems with weakly-bonded layers. The low cross-plane κ of these scalably-fabricated films is comparable to that of similarly layered niobate structures grown epitaxially.},

  doi          = {10.1111/jace.13318},

  journal      = {Journal of the American Ceramic Society},

  number       = 2,

  volume       = 98,

  place        = {United States},

  year         = {Sat Nov 08 00:00:00 EST 2014},

  month        = {Sat Nov 08 00:00:00 EST 2014}

}

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