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Volumetric study of the α→α′ phase transformation of cerium and its implications regarding the crystal structure of α′‐cerium.

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3 Author(s)
Bocquillon, G. ; Centre National de la Recherche Scientifique, 1 place Aristide‐Briand, 92190, Meudon, France ; Epain, R. ; Loriers, C.

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The volume change of cerium metal at the α→α′ phase transformation at 51 kbar is found to be (1.5±1) % from macroscopic measurements made in the sliding‐anvil apparatus SAD 2. This value supports the proposal by Zachiarasen and Ellinger that the high‐pressure forms of cerium above 51 kbar are a stable orthorhombic form with the α‐uranium type of structure and a metastable monoclinic body‐centered form with a deformed face‐centered structure and invalidate all the other crystal structures reported so far for α′‐cerium.

Published in:

Journal of Applied Physics  (Volume:49 ,  Issue: 8 )