Abstract
Multilayer surface oxidation of polycrystalline Pt wire is studied for the first time at moderate oxygen pressures using a high precision electrical resistance technique. The dependence of the oxidation rate on pressure, temperature, and time is investigated. Oxide films of up to 90 nm thickness are grown, and the temperature region for rapid dissociation of the oxide is identified. The dissociation pressure-temperature relationship for the oxide is determined in the region 450–600°C, yielding high precision values for the heat of decomposition and entropy change. A two zone model for the electrical resistance is developed and shown to agree qualitatively with the experimental results. The oxide is identified as the β phase of PtO 2 on the basis of its heat of decomposition, electron diffraction pattern, and acid solubility properties.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
