PdRhO/sub 2/ formation during the air oxidation of a Pd-15Rh alloy

Journal Article · Wed Jun 01 04:00:00 EDT 1988 · Oxid. Met.; (United States)

DOI:https://doi.org/10.1007/BF00666844· OSTI ID:6095007

Baird, R J; Graham, G W; Weber, W H

The surfaces of air-oxidized Pd-15Rh alloys have been examined by X-ray photoelectron spectroscopy (XPS) and by Raman spectroscopy. The XPS results indicate that the near-surface region of the samples oxidized in the temperature range 1075 to 1125 K contains Pd in both the +2 and +1 oxidation states and Rh in the +3 oxidation state. The ratio of Pd(I) to Rh(III) is found to be 1:1. Raman spectra confirm that two Pd-containing phases, PdO and PdRhO/sub 2/, are present in the near-surface region and eliminate the possibility that Rh/sub 2/O/sub 3/ is present. Also, a resonant Raman effect is observed in anhydrous PdO for exciting wavelengths in the vicinity of 500 nm.

• Research Organization: Ford Motor Co., Dearborn, MI (USA)
• OSTI ID: 6095007
• Journal Information: Oxid. Met.; (United States), Journal Name: Oxid. Met.; (United States) Vol. 29:5-6; ISSN OXMEA
• Country of Publication: United States
• Language: English

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33 ADVANCED PROPULSION SYSTEMS
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36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOYS
CATALYSTS
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTRON SPECTROSCOPY
EQUIPMENT
LASER SPECTROSCOPY
MATERIALS TESTING
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PALLADIUM ALLOYS
PALLADIUM BASE ALLOYS
PALLADIUM COMPOUNDS
PALLADIUM OXIDES
PHASE STUDIES
PHOTOELECTRON SPECTROSCOPY
PLATINUM METAL ALLOYS
POLLUTION CONTROL EQUIPMENT
RAMAN EFFECT
RAMAN SPECTROSCOPY
REFRACTORY METAL COMPOUNDS
RHODIUM ALLOYS
RHODIUM COMPOUNDS
RHODIUM OXIDES
SPECTROSCOPY
TESTING
TRANSITION ELEMENT COMPOUNDS
VALENCE
X-RAY SPECTROSCOPY