A.4.4 - Langasite-based Microbalance for Determination of the Non-stoichiometry in Praseodymium-Cerium Oxide Thin Films at Elevated Temperatures

S. Schröder, H. Fritze, AMA Association For Sensors And Measurement, Sophie-Charlotten-Str. 15, 14059 Berlin, Germany
The oxygen partial pressure dependent non-stoichiometry of praseodymium-cerium oxide thin films (Pr0.1Ce0.9O2-δ, PCO) is investigated at temperatures between 700 and 900 °C. The non-stoichiometry of PCO is determined gravimetrically using a high-temperature microbalance consisting of piezoelec-tric langasite (La3Ga5SiO14) resonators. Shifts of the resonance frequency are correlated with mass changes caused by oxygen incorporation/release using the Sauerbrey equation and converted into the
more » ... non-stoichiometry of PCO. Chemical and mechanical properties of the PCO films might influence the resonance frequency. Sin-gle-side deposition of PCO onto the resonators results in calculated non-stoichiometry values which exceed literature data for bulk PCO. A potential explanation is mechanical bending of the resonators due to thermo-chemical expansion. Resonators coated on both sides with PCO show smaller frequen-cy shifts corresponding to a non-stoichiometry of up to δ = 0.07, which are close to literature data.
doi:10.5162/sensor2017/a4.4 fatcat:ayvqc5juhnfi5m5kdqxydxcz4u