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PdRhO2 formation during the air oxidation of a Pd-15Rh alloy

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Abstract

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 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 PdRhO2, are present in the near-surface region and eliminate the possibility that Rh2O3 is present. Also, a resonant Raman effect is observed in anhydrous PdO for exciting wavelengths in the vicinity of 500 nm.

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Authors and Affiliations

  1. Physics Department, Research Staff, Ford Motor Co., P.O. Box 2053, 48121-2053, Dearborn, Michigan

    R. J. Baird, G. W. Graham & W. H. Weber

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  1. R. J. Baird
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  2. G. W. Graham
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  3. W. H. Weber
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Baird, R.J., Graham, G.W. & Weber, W.H. PdRhO2 formation during the air oxidation of a Pd-15Rh alloy. Oxid Met 29, 435–443 (1988). https://doi.org/10.1007/BF00666844

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  • DOI: https://doi.org/10.1007/BF00666844

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