Influence of Calcium on the Thermal Oxidation of Ca-Doped CoO and of CaO-Coated Cobalt

Nacer Halem; Zohra Halem; Ouardia Halem; Mariora Abrudeanu; Georgette Petot-Ervas

Influence of Calcium on the Thermal Oxidation of Ca-Doped CoO and of CaO-Coated Cobalt

Abstract

The present study concerns the influence of calcium on the thermal oxidation of Ca-doped Co1-xO and of CaO-coated cobalt. We have found that calcium enhanced the thermal oxidation of Co1-xO single crystals while a CaO coating leads to a decrease of the oxidation kinetic of cobalt polycrystals, at T<1200°C. From a formal treatment, based on the thermodynamic of irreversible processes, we have shown that the increase of the thermal oxidation of Ca-doped Co1-xO is due to the increase of the diffusion coefficient of cobalt in Ca-doped samples, while the beneficial effect of a CaO coating on the cobalt oxidation is due to the shift of the Co/Co1-xO phase boundary to higher PO2, leading to a decrease of the driving force of diffusion in the oxide scale.

Keywords

References

Halem, N., Halem, Z., Halem, O., Abrudeanu, M., & Petor-Ervas, G. (2025). Influence of calcium on the thermal oxidation of Ca-doped CoO and of CaO-coated cobalt. The Eurasia Proceedings of Science, Technology, Engineering and Mathematics (EPSTEM), 36, 11-20

Details

Primary Language

English

Subjects

Chemical Engineering (Other)

Journal Section

Research Article

Authors

Nacer Halem This is me
Algeria

Zohra Halem This is me
Algeria

Ouardia Halem This is me
Algeria

Mariora Abrudeanu This is me
Romania

Georgette Petot-Ervas This is me
France

Early Pub Date

October 31, 2025

Publication Date

-

Submission Date

June 12, 2025

Acceptance Date

July 16, 2025

Published in Issue

Year 2025 Volume: 36

IZ

https://izlik.org/JA74MM48WK

Cite

RIS / Bibtex

APA

Halem, N., Halem, Z., Halem, O., Abrudeanu, M., & Petot-Ervas, G. (2025). Influence of Calcium on the Thermal Oxidation of Ca-Doped CoO and of CaO-Coated Cobalt. The Eurasia Proceedings of Science Technology Engineering and Mathematics, 36, 11-20. https://izlik.org/JA74MM48WK