Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional do INMETRO |
Texto Completo: | http://hdl.handle.net/10926/1330 |
Resumo: | In this paper we explore the acoustic detection method applied to the investigation of the magnetocaloric effect in Gd and Gd5 Ge1−xSix 4 compounds, in the temperature range from 230 to 360 K and for magnetic fields up to 20 kOe. Measurements were performed in as-cast materials, both for powder and pellet samples, and in tree samples with compositions around Gd5Ge2Si2 that underwent different thermal treatments. Small differences were observed when comparing powder and pellet samples of Gd and Gd5 Ge1−xSix 4 compounds with 0.500 x 1.00. For the alloys with composition around Gd5Ge2Si2, which exhibit giant magnetostriction and coexistence of distinct phases, expressive changes were observed when comparing powder and pellet samples. Based on these cases, it is easy to see that the acoustic method can distinguish a second-order phase transition from a first-order magnetic-crystallographic one, and that it presents good sensitivity to detect spurious material phase in small quantities. |
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info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleMagnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment20102012-01-12T15:46:28Z2012-01-12T15:46:28ZIn this paper we explore the acoustic detection method applied to the investigation of the magnetocaloric effect in Gd and Gd5 Ge1−xSix 4 compounds, in the temperature range from 230 to 360 K and for magnetic fields up to 20 kOe. Measurements were performed in as-cast materials, both for powder and pellet samples, and in tree samples with compositions around Gd5Ge2Si2 that underwent different thermal treatments. Small differences were observed when comparing powder and pellet samples of Gd and Gd5 Ge1−xSix 4 compounds with 0.500 x 1.00. For the alloys with composition around Gd5Ge2Si2, which exhibit giant magnetostriction and coexistence of distinct phases, expressive changes were observed when comparing powder and pellet samples. Based on these cases, it is easy to see that the acoustic method can distinguish a second-order phase transition from a first-order magnetic-crystallographic one, and that it presents good sensitivity to detect spurious material phase in small quantities.6 p. : il.Submitted by Jonathan Barbosa (jon_crf@hotmail.com) on 2012-01-11T15:51:01Z No. of bitstreams: 1 Pires_2010.pdf: 275355 bytes, checksum: b3c1db07ee330497d16968b2e9c676b7 (MD5)Rejected by Catarina Soares(cfsoares@inmetro.gov.br), reason: on 2012-01-12T12:09:01Z (GMT)Submitted by Jonathan Barbosa (jon_crf@hotmail.com) on 2012-01-12T12:58:04Z No. of bitstreams: 1 Pires_2010.pdf: 275355 bytes, checksum: b3c1db07ee330497d16968b2e9c676b7 (MD5)Approved for entry into archive by Catarina Soares(cfsoares@inmetro.gov.br) on 2012-01-12T15:46:28Z (GMT) No. of bitstreams: 1 Pires_2010.pdf: 275355 bytes, checksum: b3c1db07ee330497d16968b2e9c676b7 (MD5)Made available in DSpace on 2012-01-12T15:46:28Z (GMT). No. of bitstreams: 1 Pires_2010.pdf: 275355 bytes, checksum: b3c1db07ee330497d16968b2e9c676b7 (MD5) Previous issue date: 2010enghttp://hdl.handle.net/10926/1330DMD_hdl_10926/1330GUIMARÃES, A. O. et al. Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment. Journal of Applied Physics, v. 107, 2010.Carvalho, Alexandre Magnus GomesGuimarães, André OliveiraSoffner, Max ErikMansanares, Antonio ManoelCoelho, Adelino de AguiarPires, Manoel José MendesGama, SérgioSilva, Edson Corrêa dainfo:eu-repo/semantics/openAccessreponame:Repositório Institucional do INMETROinstname:Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO)instacron:INMETROGuimaraes_2010.pdfhttp://xrepo01s.inmetro.gov.br/bitstream/10926/1330/1/Guimaraes_2010.pdfapplication/pdf275355http://xrepo01s.inmetro.gov.br/bitstream/10926/1330/1/Guimaraes_2010.pdfb3c1db07ee330497d16968b2e9c676b7MD510926_1330_1Guimaraes_2010.pdf.txthttp://xrepo01s.inmetro.gov.br/bitstream/10926/1330/6/Guimaraes_2010.pdf.txttext/plain32860http://xrepo01s.inmetro.gov.br/bitstream/10926/1330/6/Guimaraes_2010.pdf.txt890a37037dab17ac5097460ef09687a6MD510926_1330_62024-06-10T15:24:42Zoai:xrepo01s.inmetro.gov.br:10926/1330Repositório de Publicaçõeshttp://repositorios.inmetro.gov.br/oai/requestopendoar:2012-10-31T11:05:53Repositório Institucional do INMETRO - Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO)false |
dc.title.none.fl_str_mv |
Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment |
title |
Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment |
spellingShingle |
Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment Carvalho, Alexandre Magnus Gomes |
title_short |
Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment |
title_full |
Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment |
title_fullStr |
Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment |
title_full_unstemmed |
Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment |
title_sort |
Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment |
author |
Carvalho, Alexandre Magnus Gomes |
author_facet |
Carvalho, Alexandre Magnus Gomes Guimarães, André Oliveira Soffner, Max Erik Mansanares, Antonio Manoel Coelho, Adelino de Aguiar Pires, Manoel José Mendes Gama, Sérgio Silva, Edson Corrêa da |
author_role |
author |
author2 |
Guimarães, André Oliveira Soffner, Max Erik Mansanares, Antonio Manoel Coelho, Adelino de Aguiar Pires, Manoel José Mendes Gama, Sérgio Silva, Edson Corrêa da |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Carvalho, Alexandre Magnus Gomes Guimarães, André Oliveira Soffner, Max Erik Mansanares, Antonio Manoel Coelho, Adelino de Aguiar Pires, Manoel José Mendes Gama, Sérgio Silva, Edson Corrêa da |
description |
In this paper we explore the acoustic detection method applied to the investigation of the magnetocaloric effect in Gd and Gd5 Ge1−xSix 4 compounds, in the temperature range from 230 to 360 K and for magnetic fields up to 20 kOe. Measurements were performed in as-cast materials, both for powder and pellet samples, and in tree samples with compositions around Gd5Ge2Si2 that underwent different thermal treatments. Small differences were observed when comparing powder and pellet samples of Gd and Gd5 Ge1−xSix 4 compounds with 0.500 x 1.00. For the alloys with composition around Gd5Ge2Si2, which exhibit giant magnetostriction and coexistence of distinct phases, expressive changes were observed when comparing powder and pellet samples. Based on these cases, it is easy to see that the acoustic method can distinguish a second-order phase transition from a first-order magnetic-crystallographic one, and that it presents good sensitivity to detect spurious material phase in small quantities. |
publishDate |
2010 |
dc.date.issued.fl_str_mv |
2010 |
dc.date.available.fl_str_mv |
2012-01-12T15:46:28Z |
dc.date.accessioned.fl_str_mv |
2012-01-12T15:46:28Z |
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://hdl.handle.net/10926/1330 DMD_hdl_10926/1330 |
dc.identifier.citation.fl_str_mv |
GUIMARÃES, A. O. et al. Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment. Journal of Applied Physics, v. 107, 2010. |
url |
http://hdl.handle.net/10926/1330 |
identifier_str_mv |
DMD_hdl_10926/1330 GUIMARÃES, A. O. et al. Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: influence of composition and sample treatment. Journal of Applied Physics, v. 107, 2010. |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.bitstream.fl_str_mv |
application/pdf text/plain |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional do INMETRO instname:Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO) instacron:INMETRO |
instname_str |
Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO) |
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INMETRO |
institution |
INMETRO |
reponame_str |
Repositório Institucional do INMETRO |
collection |
Repositório Institucional do INMETRO |
repository.name.fl_str_mv |
Repositório Institucional do INMETRO - Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO) |
repository.mail.fl_str_mv |
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1801499965664526336 |