Diffusion phenomena of the oxygen and nitrogen in niobium by mechanical spectroscopy

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorFlorêncio, O.
dc.creatorSilva, P. S.
dc.creatorGrandini, Carlos Roberto
dc.date2014-05-27T11:24:41Z
dc.date2016-10-25T18:28:39Z
dc.date2014-05-27T11:24:41Z
dc.date2016-10-25T18:28:39Z
dc.date2010-05-19
dc.date.accessioned2017-04-06T01:41:20Z
dc.date.available2017-04-06T01:41:20Z
dc.identifierDefect and Diffusion Forum, v. 297-301, p. 1346-1353.
dc.identifier1012-0386
dc.identifierhttp://hdl.handle.net/11449/71687
dc.identifierhttp://acervodigital.unesp.br/handle/11449/71687
dc.identifier10.4028/www.scientific.net/DDF.297-301.1346
dc.identifier2-s2.0-77952245254
dc.identifier0000-0002-3336-309X
dc.identifierhttp://dx.doi.org/10.4028/www.scientific.net/DDF.297-301.1346
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/892636
dc.descriptionThe short-range diffusion phenomenon (Snoek Effect) was investigated by mechanical spectroscopy measurements between 300 K and 650 K, in a polycrystalline niobium sample, containing oxygen and nitrogen, using a torsion pendulum. Experimental spectra of anelastic relaxation were obtained under three conditions: as-received sample; annealed sample and subsequently annealed in an oxygen atmosphere for three hours at 1170 K in partial pressure of 5°10 -5mbar. The experimental spectra obtained were decomposed in elementary Debye peaks and the anelastic relaxation processes were identified. With anelastic relaxation parameters and the lattice parameters, the interstitial diffusion coefficients of the oxygen and nitrogen in niobium were calculated for each kind of preferential occupation (octahedral and tetrahedral). The results were compared with the literature data, and confirmed that the best adjustment is for the preferential occupation octahedral model for low concentrations of interstitial solutes, but at higher concentration of oxygen were observed deviations of experimental data for the interstitial diffusion coefficients of oxygen in niobium when compared with the literature data, this could be related to the possible occurrence of a double occupation of interstitial sites in the niobium lattice by oxygen interstitials. © (2010) Trans Tech Publications.
dc.languageeng
dc.relationDefect and Diffusion Forum
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectDiffusion coefficient
dc.subjectInternal friction
dc.subjectNiobium
dc.subjectNitrogen
dc.subjectOxygen
dc.subjectAnnealed samples
dc.subjectConcentration of
dc.subjectDebye peak
dc.subjectDiffusion Coefficients
dc.subjectDiffusion phenomena
dc.subjectExperimental data
dc.subjectExperimental spectra
dc.subjectInterstitial diffusion
dc.subjectInterstitial sites
dc.subjectInterstitial solutes
dc.subjectInterstitials
dc.subjectLattice parameters
dc.subjectLiterature data
dc.subjectLow concentrations
dc.subjectMechanical spectroscopy
dc.subjectOxygen atmosphere
dc.subjectPolycrystalline
dc.subjectSnoek effect
dc.subjectTorsion pendulum
dc.subjectAnelastic relaxation
dc.subjectElastic waves
dc.subjectEmployment
dc.subjectOrganic polymers
dc.subjectDiffusion
dc.titleDiffusion phenomena of the oxygen and nitrogen in niobium by mechanical spectroscopy
dc.typeOtro


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