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

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 {yields} Sm-type {yields} dhcp {yields} distorted fcc (hR-24) {yields} 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. (authors)

Authors:
; ;  [1];  [2]
  1. Physics, University of Alabama at Birmingham (UAB), 310 Campbell Hall, 1300 University Boulevard, Birmingham, AL, 35294-1170 (United States)
  2. Biology, Chemistry, and Mathematics, University of Montevallo, Harman Hall, Station 6480, Montevallo, AL, 35115 (United States)
Publication Date:
Research Org.:
Materials Research Society, 506 Keystone Drive, Warrendale, PA, 15086-7573 (United States)
OSTI Identifier:
21091523
Resource Type:
Conference
Resource Relation:
Conference: Symposium Actinides 2008 - Basic Science, Applications and Technology, San Francisco, CA (United States), 24-28 Mar 2008; Other Information: Country of input: France; 13 refs.; Full text available at: http://www.mrs.org/s{sub m}rs/bin.asp?CID=12409&DID=210508&DOC=FILE.PDF; Related Information: In: Proceedings of the symposium Actinides 2008 - Basic Science, Applications and Technology, by Chung, B.; Thompson, J.; Shuh, D.; Albrecht-Schmitt, T.; Gouder, T. (eds.), v. 1104, [260] pages.
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMERICIUM; CERIUM; CURIUM; FCC LATTICES; HCP LATTICES; HOLMIUM; MONOCLINIC LATTICES; ORTHORHOMBIC LATTICES; PHASE TRANSFORMATIONS; PRASEODYMIUM; PRESSURE RANGE GIGA PA; SYMMETRY; TEMPERATURE RANGE 0273-0400 K; TERBIUM

Citation Formats

Vohra, Yogesh K., Sangala, Bagvanth Reddy, Stemshorn, Andrew K., and Hope, Kevin M. High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures. United States: N. p., 2008. Web.
Vohra, Yogesh K., Sangala, Bagvanth Reddy, Stemshorn, Andrew K., & Hope, Kevin M. High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures. United States.
Vohra, Yogesh K., Sangala, Bagvanth Reddy, Stemshorn, Andrew K., and Hope, Kevin M. Tue . "High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures". United States.
@article{osti_21091523,
title = {High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures},
author = {Vohra, Yogesh K. and Sangala, Bagvanth Reddy and Stemshorn, Andrew K. and Hope, Kevin M.},
abstractNote = {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 {yields} Sm-type {yields} dhcp {yields} distorted fcc (hR-24) {yields} 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. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {7}
}

Conference:
Other availability
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