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Article Dans Une Revue High Pressure Research Année : 2010

Kinetics of the isostructural γ to α transition in cerium investigated by ultrasonics

Résumé

We performed ultrasonic pulse echo measurements on high-purity polycrystalline cerium across the isostructural γ to α-fcc-to-fcc transition, up to 13 kbar and then back down to 0.3 kbar. Our results confirm the anomalous decrease of the longitudinal sound velocity in the γ -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 γ and α phases. We have also studied the kinetics of the transition, which is well described by an Arrhenius behavior, with an activation volume of 10 cm3/mol.

Domaines

Minéralogie
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Dates et versions

hal-00464833 , version 1 (18-03-2010)

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Citer

D.L. Farber, C.M. Aracne, D.G. Ruddle, J. Siebert, B.P. Bonner, et al.. Kinetics of the isostructural γ to α transition in cerium investigated by ultrasonics. High Pressure Research, 2010, 30, pp.151-158. ⟨10.1080/08957950903554576⟩. ⟨hal-00464833⟩
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