Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy

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dc.contributor.authorAlmeida, Luciano Henrique de [UNESP]
dc.contributor.authorPires, Kelly Cristina Cezaretto [UNESP]
dc.contributor.authorGrandini, Carlos Roberto [UNESP]
dc.contributor.authorFlorĂȘncio, Odila
dc.contributor.institutionUniversidade de SĂŁo Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de SĂŁo Carlos (UFSCar)
dc.date.accessioned2014-05-20T13:26:13Z
dc.date.available2014-05-20T13:26:13Z
dc.date.issued2005-09-01
dc.description.abstractImpurity interstitial atoms present in metals with BCC structure can diffuse in the metallic matrix by jumps to energetically equivalent crystallographic sites. Anelastic spectroscopy (internal friction) is based on the measurement of mechanical loss or internal friction as a function of temperature. Due to its selective and nondestructive nature, anelastic spectroscopy is well suited for the study of diffusion of interstitial elements in metals. Internal friction measurements were made using the torsion pendulum technique with oscillation frequency of a few Hz, temperature interval from 300 to 700 K, heating rate of about 1 K/min, and vacuum better than 10-5 mbar. The polycrystalline Nb and Ta samples used were supplied by Aldrich Inc. The results obtained showed thermally activated relaxation structures due to stress-induced ordering of oxygen atoms around the Nb (or Ta) atoms of the metallic matrix. The results were interpreted by three methods and led to activation enthalpy values for the diffusion of oxygen in Nb and Ta of 1.15 eV and 1.10 eV, respectively.en
dc.description.affiliationUSP Instituto de FĂ­sica de SĂŁo Carlos
dc.description.affiliationUNESP Laboratório de RelaxaçÔes Anelåsticas
dc.description.affiliationUFSCar Departamento de FĂ­sica
dc.description.affiliationUnespUNESP Laboratório de RelaxaçÔes Anelåsticas
dc.format.extent239-243
dc.identifierhttp://dx.doi.org/10.1590/S1516-14392005000300003
dc.identifier.citationMaterials Research. ABM, ABC, ABPol, v. 8, n. 3, p. 239-243, 2005.
dc.identifier.doi10.1590/S1516-14392005000300003
dc.identifier.fileS1516-14392005000300003.pdf
dc.identifier.issn1516-1439
dc.identifier.lattes2949983867418338
dc.identifier.orcid0000-0002-3336-309X
dc.identifier.scieloS1516-14392005000300003
dc.identifier.urihttp://hdl.handle.net/11449/8418
dc.language.isoeng
dc.publisherABM, ABC, ABPol
dc.relation.ispartofMaterials Research
dc.relation.ispartofjcr1.103
dc.relation.ispartofsjr0,398
dc.rights.accessRightsAcesso aberto
dc.sourceSciELO
dc.subjectoxygen diffusionen
dc.subjectinternal frictionen
dc.subjectinterstitialsen
dc.subjectNben
dc.subjectTaen
dc.titleMeasurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopyen
dc.typeArtigo
unesp.author.lattes2949983867418338[3]
unesp.author.orcid0000-0002-3336-309X[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de CiĂȘncias, Baurupt
unesp.departmentFĂ­sica - FCpt

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