Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 21, Pages 14129-14140Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp01855j
Keywords
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Funding
- Ramon y Cajal [RYC-2013-12448]
- CSIC under JAE-Predoctorals program
- EU [EU-FP7 NMP-LA2012-280432]
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The kinetics of oxygen incorporation (in-diffusion process) and excorporation (out-diffusion process), in YBa2Cu3O6+x (YBCO) epitaxial thin films prepared using the chemical solution deposition (CSD) methodology by the trifluoroacetate route, was investigated by electrical conductivity relaxation measurements. We show that the oxygenation kinetics of YBCO films is limited by the surface exchange process of oxygen molecules prior to bulk diffusion into the films. The analysis of the temperature and oxygen partial pressure influence on the oxygenation kinetics has drawn a consistent picture of the oxygen surface exchange process enabling us to define the most likely rate determining step. We have also established a strategy to accelerate the oxygenation kinetics at low temperatures based on the catalytic influence of Ag coatings thus allowing us to decrease the oxygenation temperature in the YBCO thin films.
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