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

Journal Article · Sat Nov 08 00:00:00 EST 2014 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.13318· OSTI ID:1111302

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]

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

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.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1111302
• Report Number(s): SAND-2013-7932J; 474313
• Journal Information: Journal of the American Ceramic Society, Vol. 98, Issue 2; ISSN 0002-7820
• Publisher: American Ceramic Society
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE