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High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures

Published online by Cambridge University Press:  01 February 2011

Yogesh K. Vohra ,
Bagvanth Reddy Sangala ,
Andrew K. Stemshorn  and
Kevin M. Hope
Yogesh K. Vohra
Affiliation:
ykvohra@uab.edu, University of Alabama at Birmingham (UAB), Physics, 310 Campbell Hall, 1300 University Boulevard, Birmingham, AL, 35294-1170, United States, (205) 934-6662, (205) 975-8009
Bagvanth Reddy Sangala
Affiliation:
bagvanth@uab.edu, University of Alabama at Birmingham (UAB), Physics, 310 Campbell Hall, 1300 University Boulevard, Birmingham, AL, 35294-1170, United States
Andrew K. Stemshorn
Affiliation:
akstem@uab.edu, University of Alabama at Birmingham (UAB), Physics, 310 Campbell Hall, 1300 University Boulevard, Birmingham, AL, 35294-1170, United States
Kevin M. Hope
Affiliation:
HopeKM@montevallo.edu, University of Montevallo, Biology, Chemistry, and Mathematics, Harman Hall, Station 6480, Montevallo, AL, 35115, United States
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Abstract

High-pressure studies have been performed on heavy rare earth metals Terbium (Tb) to 155 GPa and Holmium (Ho) to 134 GPa in a diamond anvil cell at room temperature. The following crystal structure sequence was observed in both metals hcp ⟶ Sm-type ⟶ dhcp ⟶ distorted fcc (hR-24) ⟶ monoclinic (C2/m) with increasing pressure. The last transformation to a low symmetry monoclinic phase is accompanied by a volume collapse of 5 % for Tb at 51 GPa and a volume collapse of 3 % for Ho at 103 GPa. This volume collapse under high pressure is reminiscent of f-shell delocalization in light rare earth metal Cerium (Ce), Praseodymium (Pr), and heavy actinide metals Americium (Am) and Curium (Cm). The orthorhombic Pnma phase that has been reported in Am and Cm after f-shell delocalization is not observed in heavy rare earth metals under high pressures.

Keywords

actinidecrystallographic structurelanthanide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1104: Symposium NN – Actinides 2008—Basic Science, Applications and Technology , 2008 , 1104-NN01-04
Copyright
Copyright © Materials Research Society 2008

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