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Glass‐Like Thermal Conductivity of (010)‐Textured Lanthanum‐Doped Strontium Niobate Synthesized with Wet Chemical Deposition
Author(s) -
Foley Brian M.,
BrownShaklee Harlan J.,
Campion Michael J.,
Medlin Douglas L.,
Clem Paul G.,
Ihlefeld Jon F.,
Hopkins Patrick E.
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13318
Subject(s) - materials science , lanthanum , strontium , doping , strontium barium niobate , thin film , epitaxy , mineralogy , thermal conductivity , deposition (geology) , conductivity , lithium niobate , strontium titanate , analytical chemistry (journal) , composite material , inorganic chemistry , optoelectronics , nanotechnology , chemistry , ferroelectricity , dielectric , geology , paleontology , organic chemistry , layer (electronics) , chromatography , sediment
We have measured the cross‐plane thermal conductivity (κ) of (010)‐textured, undoped, and lanthanum‐doped strontium niobate (Sr 2− x La x Nb 2 O 7−δ ) thin films via time‐domain thermoreflectance. The thin films were deposited on (001)‐oriented SrTiO 3 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 Sr 2 Nb 2 O 7 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.