Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codoping

La and Nb codoping of ferroelectric five-layer Aurivillius phase Sr2Bi4Ti5O18 ( ∼ 560 K), induces compositional disorder and diffuse relaxor transitions at much lower temperatures than the parent compound, while preserving the orthorhombic structure. For moderate La and Nb concentrations, the erroel...

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Autores: Lafuerza, Sara, Gracia, David, Blasco, Javier, Evangelisti, Marco
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:132430
Acceso en línea:http://zaguan.unizar.es/record/132430
Access Level:acceso abierto
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spelling Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codopingLafuerza, SaraGracia, DavidBlasco, JavierEvangelisti, MarcoLa and Nb codoping of ferroelectric five-layer Aurivillius phase Sr2Bi4Ti5O18 ( ∼ 560 K), induces compositional disorder and diffuse relaxor transitions at much lower temperatures than the parent compound, while preserving the orthorhombic structure. For moderate La and Nb concentrations, the erroelectric properties are enhanced in the vicinity of room temperature, and so is the electrocaloric effect as measured directly with a homemade quasi-adiabatic calorimeter. The adiabatic temperature change reaches, e.g., in Sr2Bi3.44La0.5Ti4.8Nb0.2O18, ⁓ 0.3 K at 355 K with a temperature span ⁓ 15 K, under = 37 kV/cm. Besides, a large field dispersion of the electrocaloric effect is found, ascribed to field-induced transitions from short-range-ordered relaxor to long-range-ordered ferroelectric states. Indirect estimations of the electrocaloric effect from electric polarization data are not able to quantitatively predict the direct results and emphasize the need of applying direct measurement methods, especially for relaxor ferroelectrics.2024info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://zaguan.unizar.es/record/132430reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/grantAgreement/ES/DGA/E11-23Rinfo:eu-repo/grantAgreement/EC/H2020/101029019This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 101029019-EAGERinfo:eu-repo/grantAgreement/ES/MICINN/PID2021-124734OB-C21info:eu-repo/semantics/openAccessoai:zaguan.unizar.es:1324302026-05-29T13:59:51Z
dc.title.none.fl_str_mv Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codoping
title Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codoping
spellingShingle Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codoping
Lafuerza, Sara
title_short Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codoping
title_full Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codoping
title_fullStr Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codoping
title_full_unstemmed Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codoping
title_sort Electrocaloric effect near room temperature in lead-free Aurivillius phase Sr2Bi4Ti5O18 upon La and Nb codoping
dc.creator.none.fl_str_mv Lafuerza, Sara
Gracia, David
Blasco, Javier
Evangelisti, Marco
author Lafuerza, Sara
author_facet Lafuerza, Sara
Gracia, David
Blasco, Javier
Evangelisti, Marco
author_role author
author2 Gracia, David
Blasco, Javier
Evangelisti, Marco
author2_role author
author
author
description La and Nb codoping of ferroelectric five-layer Aurivillius phase Sr2Bi4Ti5O18 ( ∼ 560 K), induces compositional disorder and diffuse relaxor transitions at much lower temperatures than the parent compound, while preserving the orthorhombic structure. For moderate La and Nb concentrations, the erroelectric properties are enhanced in the vicinity of room temperature, and so is the electrocaloric effect as measured directly with a homemade quasi-adiabatic calorimeter. The adiabatic temperature change reaches, e.g., in Sr2Bi3.44La0.5Ti4.8Nb0.2O18, ⁓ 0.3 K at 355 K with a temperature span ⁓ 15 K, under = 37 kV/cm. Besides, a large field dispersion of the electrocaloric effect is found, ascribed to field-induced transitions from short-range-ordered relaxor to long-range-ordered ferroelectric states. Indirect estimations of the electrocaloric effect from electric polarization data are not able to quantitatively predict the direct results and emphasize the need of applying direct measurement methods, especially for relaxor ferroelectrics.
publishDate 2024
dc.date.none.fl_str_mv 2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/132430
url http://zaguan.unizar.es/record/132430
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/ES/DGA/E11-23R
info:eu-repo/grantAgreement/EC/H2020/101029019
This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 101029019-EAGER
info:eu-repo/grantAgreement/ES/MICINN/PID2021-124734OB-C21
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
publisher.none.fl_str_mv
dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
collection Zaguán. Repositorio Digital de la Universidad de Zaragoza
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