Kinetics of the isostructural g to a transition in cerium investigated by ultrasonics

We performed ultrasonic pulse echo measurements on high-purity polycrystalline cerium across the isostructural g to a-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 g-phase approaching the transi...

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Bibliographic Details
Published in:High pressure research 2010-03, Vol.30 (1), p.151-158
Main Authors: Antonangeli, D, Farber, D L, Aracne, C M, Ruddle, D G, Siebert, J, Bonner, B P
Format: Article
Language:English
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Summary:We performed ultrasonic pulse echo measurements on high-purity polycrystalline cerium across the isostructural g to a-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 g-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 g and a 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.
ISSN:0895-7959
DOI:10.1080/08957950903554576