Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S1516-14392005000300003 http://hdl.handle.net/11449/8418 |
Resumo: | Impurity 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. |
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Repositório Institucional da UNESP |
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Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopyoxygen diffusioninternal frictioninterstitialsNbTaImpurity 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.USP Instituto de Física de São CarlosUNESP Laboratório de Relaxações AnelásticasUFSCar Departamento de FísicaUNESP Laboratório de Relaxações AnelásticasABM, ABC, ABPolUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Universidade Federal de São Carlos (UFSCar)Almeida, Luciano Henrique de [UNESP]Pires, Kelly Cristina Cezaretto [UNESP]Grandini, Carlos Roberto [UNESP]Florêncio, Odila2014-05-20T13:26:13Z2014-05-20T13:26:13Z2005-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article239-243application/pdfhttp://dx.doi.org/10.1590/S1516-14392005000300003Materials Research. ABM, ABC, ABPol, v. 8, n. 3, p. 239-243, 2005.1516-1439http://hdl.handle.net/11449/841810.1590/S1516-14392005000300003S1516-14392005000300003S1516-14392005000300003.pdf29499838674183380000-0002-3336-309XSciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMaterials Research1.1030,398info:eu-repo/semantics/openAccess2024-04-25T17:39:50Zoai:repositorio.unesp.br:11449/8418Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:03:38.617820Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy |
title |
Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy |
spellingShingle |
Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy Almeida, Luciano Henrique de [UNESP] oxygen diffusion internal friction interstitials Nb Ta |
title_short |
Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy |
title_full |
Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy |
title_fullStr |
Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy |
title_full_unstemmed |
Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy |
title_sort |
Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy |
author |
Almeida, Luciano Henrique de [UNESP] |
author_facet |
Almeida, Luciano Henrique de [UNESP] Pires, Kelly Cristina Cezaretto [UNESP] Grandini, Carlos Roberto [UNESP] Florêncio, Odila |
author_role |
author |
author2 |
Pires, Kelly Cristina Cezaretto [UNESP] Grandini, Carlos Roberto [UNESP] Florêncio, Odila |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) Universidade Federal de São Carlos (UFSCar) |
dc.contributor.author.fl_str_mv |
Almeida, Luciano Henrique de [UNESP] Pires, Kelly Cristina Cezaretto [UNESP] Grandini, Carlos Roberto [UNESP] Florêncio, Odila |
dc.subject.por.fl_str_mv |
oxygen diffusion internal friction interstitials Nb Ta |
topic |
oxygen diffusion internal friction interstitials Nb Ta |
description |
Impurity 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. |
publishDate |
2005 |
dc.date.none.fl_str_mv |
2005-09-01 2014-05-20T13:26:13Z 2014-05-20T13:26:13Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S1516-14392005000300003 Materials Research. ABM, ABC, ABPol, v. 8, n. 3, p. 239-243, 2005. 1516-1439 http://hdl.handle.net/11449/8418 10.1590/S1516-14392005000300003 S1516-14392005000300003 S1516-14392005000300003.pdf 2949983867418338 0000-0002-3336-309X |
url |
http://dx.doi.org/10.1590/S1516-14392005000300003 http://hdl.handle.net/11449/8418 |
identifier_str_mv |
Materials Research. ABM, ABC, ABPol, v. 8, n. 3, p. 239-243, 2005. 1516-1439 10.1590/S1516-14392005000300003 S1516-14392005000300003 S1516-14392005000300003.pdf 2949983867418338 0000-0002-3336-309X |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Materials Research 1.103 0,398 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
239-243 application/pdf |
dc.publisher.none.fl_str_mv |
ABM, ABC, ABPol |
publisher.none.fl_str_mv |
ABM, ABC, ABPol |
dc.source.none.fl_str_mv |
SciELO reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128747837063168 |