Glass-like thermal conductivity of (010)-textured lanthanum-doped strontium niobate synthesized with wet chemical deposition

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

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

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. 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. Furthermore, we 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.

Original languageEnglish (US)
Pages (from-to)624-628
Number of pages5
JournalJournal of the American Ceramic Society
Volume98
Issue number2
DOIs
StatePublished - Dec 3 2014

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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