High-pressure phase transitions in rare earth metal thulium to 195 GPa.
Identifieur interne : 000442 ( PubMed/Curation ); précédent : 000441; suivant : 000443High-pressure phase transitions in rare earth metal thulium to 195 GPa.
Auteurs : Jeffrey M. Montgomery [États-Unis] ; Gopi K. Samudrala ; Georgiy M. Tsoi ; Yogesh K. VohraSource :
- Journal of physics. Condensed matter : an Institute of Physics journal [ 1361-648X ] ; 2011.
Abstract
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/V₀ = 0.38 at room temperature. The rare earth crystal structure sequence, hcp →Sm-type→ dhcp →fcc → 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.
DOI: 10.1088/0953-8984/23/15/155701
PubMed: 21460429
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Montgomery</name><affiliation wicri:level="1"><nlm:affiliation>Department of Physics, University of Alabama at Birmingham (UAB), Birmingham, AL 35294, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics, University of Alabama at Birmingham (UAB), Birmingham, AL 35294</wicri:regionArea></affiliation></author><author><name sortKey="Samudrala, Gopi K" sort="Samudrala, Gopi K" uniqKey="Samudrala G" first="Gopi K" last="Samudrala">Gopi K. Samudrala</name></author><author><name sortKey="Tsoi, Georgiy M" sort="Tsoi, Georgiy M" uniqKey="Tsoi G" first="Georgiy M" last="Tsoi">Georgiy M. Tsoi</name></author><author><name sortKey="Vohra, Yogesh K" sort="Vohra, Yogesh K" uniqKey="Vohra Y" first="Yogesh K" last="Vohra">Yogesh K. Vohra</name></author></analytic><series><title level="j">Journal of physics. Condensed matter : an Institute of Physics journal</title><idno type="eISSN">1361-648X</idno><imprint><date when="2011" type="published">2011</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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/V₀ = 0.38 at room temperature. The rare earth crystal structure sequence, hcp →Sm-type→ dhcp →fcc → 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.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="PubMed-not-MEDLINE"><PMID Version="1">21460429</PMID><DateCreated><Year>2011</Year><Month>04</Month><Day>04</Day></DateCreated><DateCompleted><Year>2011</Year><Month>08</Month><Day>10</Day></DateCompleted><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1361-648X</ISSN><JournalIssue CitedMedium="Internet"><Volume>23</Volume><Issue>15</Issue><PubDate><Year>2011</Year><Month>Apr</Month><Day>20</Day></PubDate></JournalIssue><Title>Journal of physics. Condensed matter : an Institute of Physics journal</Title><ISOAbbreviation>J Phys Condens Matter</ISOAbbreviation></Journal><ArticleTitle>High-pressure phase transitions in rare earth metal thulium to 195 GPa.</ArticleTitle><Pagination><MedlinePgn>155701</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1088/0953-8984/23/15/155701</ELocationID><Abstract><AbstractText>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/V₀ = 0.38 at room temperature. The rare earth crystal structure sequence, hcp →Sm-type→ dhcp →fcc → 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.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Montgomery</LastName><ForeName>Jeffrey M</ForeName><Initials>JM</Initials><AffiliationInfo><Affiliation>Department of Physics, University of Alabama at Birmingham (UAB), Birmingham, AL 35294, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Samudrala</LastName><ForeName>Gopi K</ForeName><Initials>GK</Initials></Author><Author ValidYN="Y"><LastName>Tsoi</LastName><ForeName>Georgiy M</ForeName><Initials>GM</Initials></Author><Author ValidYN="Y"><LastName>Vohra</LastName><ForeName>Yogesh K</ForeName><Initials>YK</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013486">Research Support, U.S. Gov't, Non-P.H.S.</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2011</Year><Month>04</Month><Day>01</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>J Phys Condens Matter</MedlineTA><NlmUniqueID>101165248</NlmUniqueID><ISSNLinking>0953-8984</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="aheadofprint"><Year>2011</Year><Month>4</Month><Day>01</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2011</Year><Month>4</Month><Day>5</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2011</Year><Month>4</Month><Day>5</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2011</Year><Month>4</Month><Day>5</Day><Hour>6</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pii">S0953-8984(11)83887-7</ArticleId><ArticleId IdType="doi">10.1088/0953-8984/23/15/155701</ArticleId><ArticleId IdType="pubmed">21460429</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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