Neutron scattering studies of premartensitic indium-thallium alloys
Identifieur interne : 000532 ( Main/Exploration ); précédent : 000531; suivant : 000533Neutron scattering studies of premartensitic indium-thallium alloys
Auteurs : RBID : ISTEX:11661_1988_Article_BF02652526.pdfAbstract
A set of measured phonon dispersion curves for In-Tl at a temperature slightly greater thanjhe structural transformation temperature,Tm, has failed to show phonon softening of the [ζζ0] [ζζ-z0] branch to within ζ = 0.15 of the zone center. To reconcile this with the known softening of the elastic constant, 1/2 (C11 —C12) requires that the dispersion curve show a strong positive curvature at low ζ along this branch. Experiments on a second set of crystals, grown as oriented flat plates, were designed to investigate the [ζζ0] [ζζ-z0] phonons and their temperature dependence in the premartensitic temperature regime. The results from these crystals support the positive curvature at low ζ for the [ζζ0] [ζζ-z0] branch. In addition the low-ζ, [ζζ0] [ζζ-z0] phonons show the normal trend of frequency increasing (hardening) as temperature is decreased toward the transformation temperature, indicating that the phonon softening predicted by the temperature dependence of the elastic modulus, 1/2 (C11 -C12), is confined to smaller phonon wave vectors than can be resolved in the present experiments.
DOI: 10.1007/BF02652526
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<record><TEI><teiHeader><fileDesc><titleStmt><title>Neutron scattering studies of premartensitic indium-thallium alloys</title><author wicri:is="80%"><name>T. R. Finlayson</name><affiliation wicri:level="1"><mods:affiliation>Department of Physics, Monash University, 3168, Clayton, Victoria, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Physics, Monash University, 3168, Clayton, Victoria</wicri:regionArea><wicri:noRegion>Victoria</wicri:noRegion></affiliation></author><author wicri:is="80%"><name>H. G. Smith</name><affiliation><mods:affiliation>Solid State Division, Martin Marietta Energy Systems Inc. Oak Ridge National Laboratory, Oak Ridge, TN, </mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation></author></titleStmt><publicationStmt><idno type="RBID">ISTEX:11661_1988_Article_BF02652526.pdf</idno><date when="1988">1988</date><idno type="doi">10.1007/BF02652526</idno><idno type="wicri:Area/Main/Corpus">000B74</idno><idno type="wicri:Area/Main/Curation">000B74</idno><idno type="wicri:Area/Main/Exploration">000532</idno></publicationStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="eng">A set of measured phonon dispersion curves for In-Tl at a temperature slightly greater thanjhe structural transformation temperature,Tm, has failed to show phonon softening of the [ζζ0] [ζζ-z0] branch to within ζ = 0.15 of the zone center. To reconcile this with the known softening of the elastic constant, 1/2 (C11 —C12) requires that the dispersion curve show a strong positive curvature at low ζ along this branch. Experiments on a second set of crystals, grown as oriented flat plates, were designed to investigate the [ζζ0] [ζζ-z0] phonons and their temperature dependence in the premartensitic temperature regime. The results from these crystals support the positive curvature at low ζ for the [ζζ0] [ζζ-z0] branch. In addition the low-ζ, [ζζ0] [ζζ-z0] phonons show the normal trend of frequency increasing (hardening) as temperature is decreased toward the transformation temperature, indicating that the phonon softening predicted by the temperature dependence of the elastic modulus, 1/2 (C11 -C12), is confined to smaller phonon wave vectors than can be resolved in the present experiments.</div></front></TEI><mods xsi:schemaLocation="http://www.loc.gov/mods/v3 file:///applis/istex/home/loadistex/home/etc/xsd/mods.xsd" version="3.4" istexId="ce6b75af701da82056236733510ff277efa939c3"><titleInfo lang="eng"><title>Neutron scattering studies of premartensitic indium-thallium alloys</title></titleInfo><name type="personal"><namePart type="given">T. R.</namePart><namePart type="family">Finlayson</namePart><role><roleTerm type="text">Senior Lecturer</roleTerm></role><affiliation>Department of Physics, Monash University, 3168, Clayton, Victoria, Australia</affiliation></name><name type="personal"><namePart type="given">H. G.</namePart><namePart type="family">Smith</namePart><role><roleTerm type="text">Research Scientist</roleTerm></role><affiliation>Solid State Division, Martin Marietta Energy Systems Inc. Oak Ridge National Laboratory, Oak Ridge, TN, </affiliation></name><typeOfResource>text</typeOfResource><genre>Original Paper</genre><originInfo><publisher>Springer-Verlag, New York</publisher><dateValid encoding="w3cdtf">2007-06-15</dateValid><copyrightDate encoding="w3cdtf">1988</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="eng">A set of measured phonon dispersion curves for In-Tl at a temperature slightly greater thanjhe structural transformation temperature,Tm, has failed to show phonon softening of the [ζζ0] [ζζ-z0] branch to within ζ = 0.15 of the zone center. To reconcile this with the known softening of the elastic constant, 1/2 (C11 —C12) requires that the dispersion curve show a strong positive curvature at low ζ along this branch. Experiments on a second set of crystals, grown as oriented flat plates, were designed to investigate the [ζζ0] [ζζ-z0] phonons and their temperature dependence in the premartensitic temperature regime. The results from these crystals support the positive curvature at low ζ for the [ζζ0] [ζζ-z0] branch. In addition the low-ζ, [ζζ0] [ζζ-z0] phonons show the normal trend of frequency increasing (hardening) as temperature is decreased toward the transformation temperature, indicating that the phonon softening predicted by the temperature dependence of the elastic modulus, 1/2 (C11 -C12), is confined to smaller phonon wave vectors than can be resolved in the present experiments.</abstract><relatedItem type="series"><titleInfo type="abbreviated"><title>MTA</title></titleInfo><titleInfo><title>Metallurgical Transactions A</title><partNumber>Year: 1988</partNumber><partNumber>Volume: 19</partNumber><partNumber>Number: 2</partNumber></titleInfo><genre>Archive Journal</genre><originInfo><dateIssued encoding="w3cdtf">1988-02-01</dateIssued><copyrightDate encoding="w3cdtf">1988</copyrightDate></originInfo><subject usage="primary"><topic>Chemistry</topic><topic>Physical Chemistry</topic><topic>Materials Science</topic><topic>Structural Materials</topic><topic>Metallic Materials</topic><topic>Ceramics, Glass, Composites, Natural Methods</topic></subject><identifier type="issn">0360-2133</identifier><identifier type="issn">Electronic: 1543-1940</identifier><identifier type="matrixNumber">11661</identifier><identifier type="local">IssueArticleCount: 34</identifier><recordInfo><recordOrigin>The Metallurgical Society of AIME, 1988</recordOrigin></recordInfo></relatedItem><identifier type="doi">10.1007/BF02652526</identifier><identifier type="matrixNumber">Art6</identifier><identifier type="local">BF02652526</identifier><accessCondition type="use and reproduction">MetadataGrant: OpenAccess</accessCondition><accessCondition type="use and reproduction">AbstractGrant: OpenAccess</accessCondition><accessCondition type="restriction on access">BodyPDFGrant: Restricted</accessCondition><accessCondition type="restriction on access">BodyHTMLGrant: Restricted</accessCondition><accessCondition type="restriction on access">BibliographyGrant: Restricted</accessCondition><accessCondition type="restriction on access">ESMGrant: Restricted</accessCondition><part><extent unit="pages"><start>193</start><end>198</end></extent></part><recordInfo><recordOrigin>The Metallurgical Society of AIME, 1988</recordOrigin><recordIdentifier>11661_1988_Article_BF02652526.pdf</recordIdentifier></recordInfo></mods></record>Pour manipuler ce document sous Unix (Dilib)
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