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

作者：Cambedouzou Julien^*; Landois Perine; Rouziere Stephan; Pinault Mathieu; Mocuta Cristian; Hennet Louis; Thiaudiere Dominique; Mayne L'Hermite Martine; Launois Pascale

来源：Physical Review B, 2013, 88(8): 081402.

DOI：10.1103/PhysRevB.88.081402

The thermal expansion of alpha-Fe (ferrite) and gamma-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 degrees C. A scenario involving progressive carbon uptake in gamma-Fe nanocrystals gives a satisfactory understanding of the phenomenon, and allows one to propose a value of the carbon solubilization rate in gamma-Fe particles confined inside MWCNTs.

• 出版日期2013-8-8
• 单位中国地震局