Thermal expansion of rare-earth pyrosilicates

The use of RE2Si2O7 materials as environmental barrier coatings (EBCs) and in the sintering process of advanced ceramics demands a precise knowledge of the coefficient of thermal expansion of the RE2Si2O7. High-temperature X-ray diffraction (HTXRD) patterns were collected on different RE2Si2O7 polym...

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Autores: Fernández-Carrión, Alberto J., Allix, Mathieu, Becerro, Ana Isabel
Tipo de documento: artigo
Estado:Versión enviada para evaluación y publicación
Data de publicação:2013
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/415052
Acesso em linha:http://hdl.handle.net/10261/415052
https://api.elsevier.com/content/abstract/scopus_id/84880317650
Access Level:Acceso aberto
Palavra-chave:Thermal expansion
Enviromental barrier coatings
Rare earth pyroslicates
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spelling Thermal expansion of rare-earth pyrosilicatesFernández-Carrión, Alberto J.Allix, MathieuBecerro, Ana IsabelThermal expansionEnviromental barrier coatingsRare earth pyroslicatesThe use of RE2Si2O7 materials as environmental barrier coatings (EBCs) and in the sintering process of advanced ceramics demands a precise knowledge of the coefficient of thermal expansion of the RE2Si2O7. High-temperature X-ray diffraction (HTXRD) patterns were collected on different RE2Si2O7 polymorphs, namely A, G, α, β, γ, and δ, to determine the changes in unit cell dimensions. RE2Si2O7 compounds belonging to the same polymorph showed, qualitatively, very similar unit cell parameters behavior with temperature, whereas the different polymorphs of a given RE2Si2O7 compound exhibited markedly different thermal expansion evolution. The isotropy of thermal expansion was demonstrated for the A-RE2Si2O7 polymorph while the rest of polymorphs exhibited an anisotropic unit cell expansion with the biggest expansion directed along the REOx polyhedral chains. The apparent bulk thermal expansion coeficcients (ABCTE) were calculated from the unit cell volume expansion for each RE2Si2O7 compound. All compounds belonging to the same polymorph exhibited similar ABCTE values. However, the ABCTE values differ significantly from one polymorph to the other. The highest ABCTE values correspond to A-RE2Si2O7 compounds, with an average of 12.1 × 10−6 K−1, whereas the lowest values are those of β- and γ-RE2Si2O7, which showed average ABCTE values of ~4.0 × 10−6 K−1.A.J. Fernández-Carrión gratefully acknowledges an F.P.D.I. grant from Junta de Andalucía. Supported by DGICYT (project no. CTQ2010-14874/BQU) and Junta de Andalucía (JA FQM 06090)Peer reviewedJohn Wiley & SonsJunta de AndalucíaFernández-Carrión, A.J. [0000-0001-8320-2828]Becerro, Ana Isabel [0000-0003-2243-5438]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262013info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Preprintinfo:eu-repo/semantics/submittedVersionapplication/pdfhttp://hdl.handle.net/10261/415052https://api.elsevier.com/content/abstract/scopus_id/84880317650reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1111/jace.12388Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4150522026-05-22T06:33:51Z
dc.title.none.fl_str_mv Thermal expansion of rare-earth pyrosilicates
title Thermal expansion of rare-earth pyrosilicates
spellingShingle Thermal expansion of rare-earth pyrosilicates
Fernández-Carrión, Alberto J.
Thermal expansion
Enviromental barrier coatings
Rare earth pyroslicates
title_short Thermal expansion of rare-earth pyrosilicates
title_full Thermal expansion of rare-earth pyrosilicates
title_fullStr Thermal expansion of rare-earth pyrosilicates
title_full_unstemmed Thermal expansion of rare-earth pyrosilicates
title_sort Thermal expansion of rare-earth pyrosilicates
dc.creator.none.fl_str_mv Fernández-Carrión, Alberto J.
Allix, Mathieu
Becerro, Ana Isabel
author Fernández-Carrión, Alberto J.
author_facet Fernández-Carrión, Alberto J.
Allix, Mathieu
Becerro, Ana Isabel
author_role author
author2 Allix, Mathieu
Becerro, Ana Isabel
author2_role author
author
dc.contributor.none.fl_str_mv Junta de Andalucía
Fernández-Carrión, A.J. [0000-0001-8320-2828]
Becerro, Ana Isabel [0000-0003-2243-5438]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Thermal expansion
Enviromental barrier coatings
Rare earth pyroslicates
topic Thermal expansion
Enviromental barrier coatings
Rare earth pyroslicates
description The use of RE2Si2O7 materials as environmental barrier coatings (EBCs) and in the sintering process of advanced ceramics demands a precise knowledge of the coefficient of thermal expansion of the RE2Si2O7. High-temperature X-ray diffraction (HTXRD) patterns were collected on different RE2Si2O7 polymorphs, namely A, G, α, β, γ, and δ, to determine the changes in unit cell dimensions. RE2Si2O7 compounds belonging to the same polymorph showed, qualitatively, very similar unit cell parameters behavior with temperature, whereas the different polymorphs of a given RE2Si2O7 compound exhibited markedly different thermal expansion evolution. The isotropy of thermal expansion was demonstrated for the A-RE2Si2O7 polymorph while the rest of polymorphs exhibited an anisotropic unit cell expansion with the biggest expansion directed along the REOx polyhedral chains. The apparent bulk thermal expansion coeficcients (ABCTE) were calculated from the unit cell volume expansion for each RE2Si2O7 compound. All compounds belonging to the same polymorph exhibited similar ABCTE values. However, the ABCTE values differ significantly from one polymorph to the other. The highest ABCTE values correspond to A-RE2Si2O7 compounds, with an average of 12.1 × 10−6 K−1, whereas the lowest values are those of β- and γ-RE2Si2O7, which showed average ABCTE values of ~4.0 × 10−6 K−1.
publishDate 2013
dc.date.none.fl_str_mv 2013
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Preprint
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format article
status_str submittedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/415052
https://api.elsevier.com/content/abstract/scopus_id/84880317650
url http://hdl.handle.net/10261/415052
https://api.elsevier.com/content/abstract/scopus_id/84880317650
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1111/jace.12388
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv John Wiley & Sons
publisher.none.fl_str_mv John Wiley & Sons
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
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