A multimodal approach to revisiting oxidation defects in Cr2O3

Auguste, Rasheed; Chan, H. L.; Romanovskaia, Elena; Qiu, J.; Schoell, R.; Liedke, M. O.; Butterling, M.; Hirschmann, E.; Attallah, A. G.; Wagner, A.; Selim, Farida A.; Kaoumi, Djamel; Uberuaga, B. P.; Hosemann, Peter; Scully, John R.

doi:10.1038/s41529-022-00269-7

Title: A multimodal approach to revisiting oxidation defects in Cr₂O₃

Journal Article · 25 July 2022 · npj Materials Degradation

DOI: https://doi.org/10.1038/s41529-022-00269-7 · OSTI ID:1877955

^[1];

^[2];

^[2]; Qiu, J. ^[1]; Schoell, R. ^[3];

^[4];

^[5]; Wagner, A. ^[4]; Selim, Farida A. ^[6]; Kaoumi, Djamel ^[3];

^[7]; Hosemann, Peter ^[1];

^[2]

Univ. of California, Berkeley, CA (United States)
Univ. of Virginia, Charlottesville, VA (United States)
North Carolina State Univ., Raleigh, NC (United States)
Helmholtz-Zentrum Dresden (HZD) (Germany)
Helmholtz-Zentrum Dresden (HZD) (Germany); Minia University (Egypt)
Bowling Green State Univ., OH (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The oxidation of chromium in air at 700 °C was investigated with a focus on point defect behavior and transport during oxide layer growth. A comprehensive set of characterization techniques targeted characteristics of chromium oxide microstructure and chemical composition analysis. TEM showed that the oxide was thicker with longer oxidation times and that, for the thicker oxides, voids formed at the metal/oxide interface. PAS revealed that the longer the oxidation time, there was an overall reduction in vacancy-type defects, though chromium monovacancies were not found in either case. EIS found that the longer oxidized material was more electrochemically stable and that, while all oxides displayed p-type character, the thicker oxide had an overall lower charge carrier density. Together, the results suggest anion oxygen interstitials and chromium vacancy cluster complexes drive transport in an oxidizing environment at this temperature, providing invaluable insight into the mechanisms that regulate corrosion.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Fundamental Understanding of Transport Under Reactor Extremes (FUTURE); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: Helmholtz Association; Helmholtz Energy Materials Characterization Platform; National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 89233218CNA000001; AC02-05CH11231

OSTI ID:: 1877955

Report Number(s):: LA-UR-22-20915

Journal Information:: npj Materials Degradation, Journal Name: npj Materials Degradation Journal Issue: 1 Vol. 6; ISSN 2397-2106

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Title: A multimodal approach to revisiting oxidation defects in Cr2O3

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Title: A multimodal approach to revisiting oxidation defects in Cr₂O₃