A New Allotropic Phase of Cerium Above 122 Kbar
It is well known that cerium metal appears in many different allotropic phases. The existence of two fcc phases, γ and α, has been the subject of extensive study particularly relative to the behavior of the 4f electrons in this transition. At pressures higher than 50 kbar, α-Ce transforms to a superconducting α′ phase . Conflicting results have been reported on the crystal structure of α′-Ce [2–6]. During the course of an x-ray diffraction study to clarify this Situation, we found another allotropic phase around 120 kbar pressure. This paper deals with the crystal structure of the new phase and the resistance change associated with the transition from the α′ phase to the new phase.
KeywordsTetragonal Phase Resistance Measurement Unit Cell Dimension Bridgman Anvil Atomic Scattering Factor
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