| High-pressure phase transitions in rare earth metal thulium to 195 GPa. | |
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MedLine Citation:
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PMID: 21460429 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We have performed image plate x-ray diffraction studies on a heavy rare earth metal, thulium (Tm), in a diamond anvil cell to a pressure of 195 GPa and volume compression V/V(o) = 0.38 at room temperature. The rare earth crystal structure sequence, [Formula: see text] distorted fcc, is observed in Tm below 70 GPa with the exception of a pure fcc phase. The focus of our study is on the ultrahigh-pressure phase transition and Rietveld refinement of crystal structures in the pressure range between 70 and 195 GPa. The hexagonal hR- 24 phase is seen to describe the distorted fcc phase between 70 and 124 GPa. Above 124 ± 4 GPa, a structural transformation from hR 24 phase to a monoclinic C 2/m phase is observed with a volume change of - 1.5%. The equation of state data shows rapid stiffening above the phase transition at 124 GPa and is indicative of participation of f-electrons in bonding. We compare the behavior of Tm to other heavy rare-earths and heavy actinide metals under extreme conditions of pressure. |
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Authors:
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Jeffrey M Montgomery; Gopi K Samudrala; Georgiy M Tsoi; Yogesh K Vohra |
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Publication Detail:
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Type: Journal Article Date: 2011-04-01 |
Journal Detail:
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Title: Journal of physics. Condensed matter : an Institute of Physics journal Volume: 23 ISSN: 1361-648X ISO Abbreviation: J Phys Condens Matter Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-04-04 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101165248 Medline TA: J Phys Condens Matter Country: England |
Other Details:
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Languages: eng Pagination: 155701 Citation Subset: IM |
Affiliation:
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Department of Physics, University of Alabama at Birmingham (UAB), Birmingham, AL 35294, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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