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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2013

Anomalous thermal expansion of γ -iron nanocrystals inside multiwalled carbon nanotubes

Résumé

The thermal expansion of α-Fe (ferrite) and γ -Fe (austenite) nanocrystals confined inside multiwalled carbon nanotubes (MWCNTs) is studied in situ, using synchrotron x-ray diffraction, as a function of temperature. While the thermal expansion of ferrite is similar to that of bulk material, a peculiar behavior is evidenced for austenite: The thermal expansion becomes abnormally high above 500 ◦C. A scenario involving progressive carbon uptake in γ -Fe nanocrystals gives a satisfactory understanding of the phenomenon, and allows one to propose a value of the carbon solubilization rate in γ -Fe particles confined inside MWCNTs.
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hal-01339478 , version 1 (29-06-2016)

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J. Cambedouzou, Perine Landois, Stéphan Rouzière, Mathieu Pinault, Cristian Mocuta, et al.. Anomalous thermal expansion of γ -iron nanocrystals inside multiwalled carbon nanotubes. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 88, pp.081402(R). ⟨10.1103/PhysRevB.88.081402⟩. ⟨hal-01339478⟩
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