The surface cation densities of iron oxide-chromium oxide solid solutions

M. C. Kung; Harold H Kung

doi:10.1016/0039-6028(81)90134-5

The surface cation densities of iron oxide-chromium oxide solid solutions

M. C. Kung, Harold H Kung

Northwestern University

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

The surface cation densities of Fe_xCr_{2 - x}O₃ solid solutions were determined for x = 0.5, 1, and 1.5 using Auger Electron Spectroscopy on samples that had been equilibrated in air at 798 or 973 K. Cr(VI) was found to be present on the surface by iodometric titration. The results indicated that the Cr(VI) Cr(III) ratio was constant, independent of composition. Compared to the bulk densities, Fe was found to be enriched on the surface for x = 0.5 and 1, but depleted for x = 1.5.

Original language	English
Pages (from-to)	253-269
Number of pages	17
Journal	Surface Science
Volume	104
Issue number	1
DOIs	https://doi.org/10.1016/0039-6028(81)90134-5
Publication status	Published - Mar 1 1981

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Condensed Matter Physics
Surfaces and Interfaces

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abstract = "The surface cation densities of FexCr2 - xO3 solid solutions were determined for x = 0.5, 1, and 1.5 using Auger Electron Spectroscopy on samples that had been equilibrated in air at 798 or 973 K. Cr(VI) was found to be present on the surface by iodometric titration. The results indicated that the Cr(VI) Cr(III) ratio was constant, independent of composition. Compared to the bulk densities, Fe was found to be enriched on the surface for x = 0.5 and 1, but depleted for x = 1.5.",

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AB - The surface cation densities of FexCr2 - xO3 solid solutions were determined for x = 0.5, 1, and 1.5 using Auger Electron Spectroscopy on samples that had been equilibrated in air at 798 or 973 K. Cr(VI) was found to be present on the surface by iodometric titration. The results indicated that the Cr(VI) Cr(III) ratio was constant, independent of composition. Compared to the bulk densities, Fe was found to be enriched on the surface for x = 0.5 and 1, but depleted for x = 1.5.

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