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

Auteur(s): Cambedouzou J., Landois P., Rouzière Stéphan, Pinault Mathieu, Mocuta Cristian, Hennet Louis, Thiaudière Dominique, Mayne-L'Hermite Martine, Launois Pascale

(Article) Publié: -Physical Review B Condensed Matter And Materials Physics (1998-2015), vol. 88 p.081402(R) (2013)


Ref HAL: hal-01339478_v1
DOI: 10.1103/PhysRevB.88.081402
WoS: 000322913200001
Exporter : BibTex | endNote
3 Citations
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.