Phase pure Pr0.1Ce0.9O1.95 (PCO) powder was prepared through glycine nitrate combustion and subsequent calcination at 1100oC in air. This powder was then pressed in a stainless steel die and fired to 1450oC to produce a pulsed laser deposition (PLD target). In preparation for PLD, (001) oriented 9.5% yttria doped zirconia (YSZ) and (001) oriented magnesium oxide (MgO) substrates (Crystec, GmbH) were pre-annealed at 1450oC for 20 hours to remove residual stress within them. PCO PLD was then conducted at 680oC for 30 min, with a 10-5 torr oxygen partial pressure. After deposition, the PCO bilayers were re-equilibrated with air by firing them in air at 1000oC for 1 hour.
To measure kchem, a solution of Fick’s second law was fit to the bilayer curvature response of PCO|YSZ samples responding to abrupt oxygen partial pressure changes (0.21 – 0.021), as shown in Fig. 1 (a). Then the data was fitted to to get kchem values. To measure the biaxial modulus, CTE and CCE, curvature values for PCO|YSZ and PCO|MgO were measured from 25oC to 700oC with a 0.5oC/min ramping rate, converted to stress using Stoney’s equation, and determined using the dual substrate method .
As shown in Fig. 1 (b), the PCO thin film kchem values measured here were comparable with other literature PCO thin film kchem values measured using electrode-free techniques such optical relaxation [5, 6]. However, the PCO kchem values measured here were 1-2 orders lower than those measured via impedance spectroscopy (which uses electrodes) [5, 7, 8]. Additional experiments to measure the PCO biaxial modulus, CTE and CCE are underway.
This material is based upon work supported by the Department of Energy under Award Number DE-FE0023315.
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