Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing

In the present study, thermoelectric Bi2Ca2-xKxCo2Oy ceramic materials (x = 0.0, 0.05, 0.075, 0.10, and 0.125) in different forms (called bulk, as-grown and annealed fibers) have been manufactured via a classical solid-state method and textured using the laser floating zone (LFZ) technique. The iden...

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Autores: Özçelik, Can, Depci, Tolga, Gürsul, Mehmet, Çetin, Gize, Özçelik, Bekir, Torres, M. A., Madre, M. A., Sotelo, Andres
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/266317
Acceso en línea:http://hdl.handle.net/10261/266317
Access Level:acceso abierto
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spelling Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processingÖzçelik, CanDepci, TolgaGürsul, MehmetÇetin, GizeÖzçelik, BekirTorres, M. A.Madre, M. A.Sotelo, AndresIn the present study, thermoelectric Bi2Ca2-xKxCo2Oy ceramic materials (x = 0.0, 0.05, 0.075, 0.10, and 0.125) in different forms (called bulk, as-grown and annealed fibers) have been manufactured via a classical solid-state method and textured using the laser floating zone (LFZ) technique. The identification and characteristics of undoped and doped samples were determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD patterns of all samples have shown great similarity, and the major peaks can be assigned to the Bi2Sr2Co2Oy thermoelectric phase, independently of the processing technique and K-doping. SEM-EDS have indicated the randomly oriented plate like grains of different sizes in bulk sample, evolving to longer and well-oriented grain structure through K-doping and LFZ. Because of the incongruent melting properties of compound, the high number of secondary phases formed in the as-grown samples. In order to reduce it, an annealing and K-doping process have been applied. The microstructural evolution is reflected on the electrical properties, and the lowest resistivity values are found in the annealed K-doped fibers. Seebeck coefficient is positive in all cases, pointing out to p-type conduction mechanism. These modifications led to PF values up to 0.162 mW/(K2m), obtained in 0.10 K-doped annealed fibers at 650 °C.The results used in the framework of this study are related to the MSc thesis of C. Özçelik. B.Ö thanks to Cukurova University Scientific Research Projects Unit for the project (FBA-2020-13007). M. A. Torres, M. A. Madre, and A. Sotelo acknowledge MINECO-FEDER (MAT2017-82183-C3-1-R, and Gobierno de Aragón-FEDER (Research Group T54-20R) for funding. Authors acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza.Peer reviewedElsevierÇukurova ÜniversityAgencia Estatal de Investigación (España)Ministerio de Ciencia, Innovación y Universidades (España)Gobierno de AragónEuropean CommissionUniversidad de ZaragozaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202220222021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/266317reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2017-82183-C3-1-Rhttps://doi.org/10.1016/j.solidstatesciences.2021.106732Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2663172026-05-22T06:33:51Z
dc.title.none.fl_str_mv Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing
title Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing
spellingShingle Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing
Özçelik, Can
title_short Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing
title_full Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing
title_fullStr Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing
title_full_unstemmed Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing
title_sort Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing
dc.creator.none.fl_str_mv Özçelik, Can
Depci, Tolga
Gürsul, Mehmet
Çetin, Gize
Özçelik, Bekir
Torres, M. A.
Madre, M. A.
Sotelo, Andres
author Özçelik, Can
author_facet Özçelik, Can
Depci, Tolga
Gürsul, Mehmet
Çetin, Gize
Özçelik, Bekir
Torres, M. A.
Madre, M. A.
Sotelo, Andres
author_role author
author2 Depci, Tolga
Gürsul, Mehmet
Çetin, Gize
Özçelik, Bekir
Torres, M. A.
Madre, M. A.
Sotelo, Andres
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Çukurova Üniversity
Agencia Estatal de Investigación (España)
Ministerio de Ciencia, Innovación y Universidades (España)
Gobierno de Aragón
European Commission
Universidad de Zaragoza
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description In the present study, thermoelectric Bi2Ca2-xKxCo2Oy ceramic materials (x = 0.0, 0.05, 0.075, 0.10, and 0.125) in different forms (called bulk, as-grown and annealed fibers) have been manufactured via a classical solid-state method and textured using the laser floating zone (LFZ) technique. The identification and characteristics of undoped and doped samples were determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD patterns of all samples have shown great similarity, and the major peaks can be assigned to the Bi2Sr2Co2Oy thermoelectric phase, independently of the processing technique and K-doping. SEM-EDS have indicated the randomly oriented plate like grains of different sizes in bulk sample, evolving to longer and well-oriented grain structure through K-doping and LFZ. Because of the incongruent melting properties of compound, the high number of secondary phases formed in the as-grown samples. In order to reduce it, an annealing and K-doping process have been applied. The microstructural evolution is reflected on the electrical properties, and the lowest resistivity values are found in the annealed K-doped fibers. Seebeck coefficient is positive in all cases, pointing out to p-type conduction mechanism. These modifications led to PF values up to 0.162 mW/(K2m), obtained in 0.10 K-doped annealed fibers at 650 °C.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/266317
url http://hdl.handle.net/10261/266317
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2017-82183-C3-1-R
https://doi.org/10.1016/j.solidstatesciences.2021.106732
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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