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Journal Article

Wüstite (Fe1−xO) – Thermodynamics and crystal growth

Authors

Hamada,  Maki
External Organizations;

Ganschow,  Steffen
External Organizations;

Klimm,  Detlef
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Serghiou,  George
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/persons/resource/hanni

Reichmann,  Hans-Josef
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Bickermann,  Matthias
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5011961.pdf
(Publisher version), 874KB

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Citation

Hamada, M., Ganschow, S., Klimm, D., Serghiou, G., Reichmann, H.-J., Bickermann, M. (2022): Wüstite (Fe1−xO) – Thermodynamics and crystal growth. - Zeitschrift für Naturforschung B, 77, 6, 463-468.
https://doi.org/10.1515/znb-2022-0071


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5011961
Abstract
Iron(II) oxide, wüstite, is the iron oxide with the lowest oxygen content. Under ambient conditions it is metastable for two reasons: (1) it undergoes eutectoid decomposition to Fe and Fe3O4 below ≈570° C, and (2) depending on temperature, it is thermodynamically stable only for very low oxygen partial pressures, down to below 10−20 bar. Hence, for the growth of single crystals from the melt, the growth atmosphere must contain reducing components to keep the oxygen partial pressure on the required low level. With Ar/CO2/CO mixtures this aim can be reached. It is shown experimentally and by thermodynamic calculation, that the grown crystals contain carbon inclusions. Theoretically it is shown that wüstite crystals without carbon inclusions could be grown in humid N2/H2 mixtures. First experiments are presented in this article, but a further adjustment of experimental parameters is required.