Kinetics of the isostructural to transition in cerium investigated by ultrasonics | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Kinetics of the isostructural to transition in cerium investigated by ultrasonics

Type de publication:

Journal Article

Source:

High Pressure Research, Volume 30, Ticket 1, p.151-158 (2010)

ISBN:

0895-7959

Numéro d'accès:

ISI:000275680900028

URL:

http://www.tandfonline.com/doi/abs/10.1080/08957950903554576

Mots-clés:

kinetics, phase transition, UMR 7154 ; Minéralogie ; cerium

Résumé:

We performed ultrasonic pulse echo measurements on high-purity polycrystalline cerium across the isostructural to -fcc-to-fcc transition, up to 13kbar and then back down to 0.3kbar. Our results confirm the anomalous decrease of the longitudinal sound velocity in the -phase approaching the transition, a significant hysteresis loop, and definitively highlight the strong difference in the long wavelength limit of the lattice dynamics of the and phases. We have also studied the kinetics of the transition, which is well described by an Arrhenius behavior, with an activation volume of 10cm3/mol.

Notes:

Antonangeli, D. Farber, D. L. Aracne, C. M. Ruddle, D. G. Siebert, J. Bonner, B. P. 47th Meeting of the European-High-Pressure-Research-Group (EHPRG 47) SEP 06-11, 2009 Paris, FRANCE