High Temperature Conductivity In Transparent Strontium-Doped Samarium Oxide Thin Films

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Functional oxide thin films are promising candidates for high-temperature applications due to their thermal stability and tunable defect chemistry. In this work, we investigate strontium-doped samarium oxide thin films. While the bulk synthesis of the equimolar ceramic compound has been previously reported, [1] to our knowledge the work herein is the first demonstration of this material fabricated as a thin film and the first investigation of its electrochemical properties. Thin films were deposited on LSAT (001) and MgO (001) via Pulse Laser Deposition (PLD) to evaluate the influence of the substrate on the film microstructure and enable in-plane conductivity measurements. Despite the absence of epitaxial growth on either substrate, the transparent films grown were confirmed with XRD to have a cubic structure with primary reflections in the (222) and (444). MICROMATTER™ certified standards were used to calibrate an XRF fundamental parameters thickness model for Sr/Sm. As expected, the Sr wt% in the thin film samples correlated closely with the Sr content of the PLD bulk targets 0, 2, 3.5, and 7 wt% Sr. Electrochemical Impedance Spectroscopy was used to probe the functional properties over a range of frequencies [1MHz - 0.1Hz] and temperatures [300 - 760°C]. Subsequently the conductivities and activation energies were calculated. This work establishes strontium-doped samarium oxide as a viable functional oxide film and provides new insight into its potential for high-temperature applications. [1] C. E. CURTIS, J. R. JOHNSON, Journal of the American Ceramic Society 1957 , 40, 15.

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