Glass‐Like Thermal Conductivity of (010)‐Textured Lanthanum‐Doped Strontium Niobate Synthesized with Wet Chemical Deposition. Issue 2 (8th November 2014)

• Record Type: Journal Article
• Authors: Foley, Brian M.; Brown‐Shaklee, Harlan J.; Campion, Michael J.; Medlin, Douglas L.; Clem, Paul G.; Ihlefeld, Jon F.; Hopkins, Patrick E.; White, M.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 2(2015)
• Page Start: 624
• Page End: 628
• Publication Date: 2014-11-08
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13318
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13318-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>We have measured the cross‐plane thermal conductivity (κ) of (010)‐textured, undoped, and lanthanum‐doped strontium niobate (Sr_{2−<italic>x</italic>}La_{<italic>x</italic>}Nb₂O_7−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 <italic>b</italic>‐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.</p> </abstract>