Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processing

Donor-doped CaMnO3 is an n-type semiconductor with perovskite structure, being considered as a potential n-type leg in thermoelectric modules. This oxide presents stability at high temperatures and allows tuning the relevant electrical and thermal transport properties through doping. In this work, C...

Descripción completa

Detalles Bibliográficos
Autores: Ferreira, N.M., Sarabando, A.R., Ferro, M.C., Madre, M.A., Dura, O.J., Sotelo, A.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Institución:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:107392
Acceso en línea:http://zaguan.unizar.es/record/107392
Access Level:acceso abierto
id ES_1e1e6d1fce062edd3bf3157fdbe0a2e2
oai_identifier_str oai:zaguan.unizar.es:107392
network_acronym_str ES
network_name_str España
repository_id_str
spelling Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processingFerreira, N.M.Sarabando, A.R.Ferro, M.C.Madre, M.A.Dura, O.J.Sotelo, A.Donor-doped CaMnO3 is an n-type semiconductor with perovskite structure, being considered as a potential n-type leg in thermoelectric modules. This oxide presents stability at high temperatures and allows tuning the relevant electrical and thermal transport properties through doping. In this work, Ca0.9Gd0.1MnO3 precursors have been prepared to produce fibres through the laser floating zone technique using different pulling rates. However, as-grown fibres did not present thermoelectric properties due to the presence of high amounts of secondary phases, leading to very high electrical resistivity values. The results have highlighted the importance of annealing procedures to reduce electrical resistivity, due to the decrease of secondary phases amount, and producing promising thermoelectric performances. The annealed samples present higher ZT values when the growth rate is decreased, reaching around 0.22 for the lowest growth rate, which is very close to the best values reported in the literature for these materials. Moreover, this procedure possesses an additional advantage considering that these samples can be directly used as n-type legs in thermoelectric modules for high-temperature applications. However, further studies should be made to determine the optimal amount of dopant.2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://zaguan.unizar.es/record/107392reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/grantAgreement/ES/DGA-FEDER/T54-17Rinfo:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2017-82183-C3-1-Rinfo:eu-repo/semantics/openAccessoai:zaguan.unizar.es:1073922026-05-29T13:59:51Z
dc.title.none.fl_str_mv Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processing
title Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processing
spellingShingle Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processing
Ferreira, N.M.
title_short Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processing
title_full Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processing
title_fullStr Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processing
title_full_unstemmed Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processing
title_sort Tuning thermoelectric properties of Ca0.9Gd0.1MnO3 by laser processing
dc.creator.none.fl_str_mv Ferreira, N.M.
Sarabando, A.R.
Ferro, M.C.
Madre, M.A.
Dura, O.J.
Sotelo, A.
author Ferreira, N.M.
author_facet Ferreira, N.M.
Sarabando, A.R.
Ferro, M.C.
Madre, M.A.
Dura, O.J.
Sotelo, A.
author_role author
author2 Sarabando, A.R.
Ferro, M.C.
Madre, M.A.
Dura, O.J.
Sotelo, A.
author2_role author
author
author
author
author
description Donor-doped CaMnO3 is an n-type semiconductor with perovskite structure, being considered as a potential n-type leg in thermoelectric modules. This oxide presents stability at high temperatures and allows tuning the relevant electrical and thermal transport properties through doping. In this work, Ca0.9Gd0.1MnO3 precursors have been prepared to produce fibres through the laser floating zone technique using different pulling rates. However, as-grown fibres did not present thermoelectric properties due to the presence of high amounts of secondary phases, leading to very high electrical resistivity values. The results have highlighted the importance of annealing procedures to reduce electrical resistivity, due to the decrease of secondary phases amount, and producing promising thermoelectric performances. The annealed samples present higher ZT values when the growth rate is decreased, reaching around 0.22 for the lowest growth rate, which is very close to the best values reported in the literature for these materials. Moreover, this procedure possesses an additional advantage considering that these samples can be directly used as n-type legs in thermoelectric modules for high-temperature applications. However, further studies should be made to determine the optimal amount of dopant.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/107392
url http://zaguan.unizar.es/record/107392
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/ES/DGA-FEDER/T54-17R
info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2017-82183-C3-1-R
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
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869404318269964288
score 15,300719

Similares en LA Referencia