Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/29017
Full metadata record
DC FieldValueLanguage
dc.contributor.authorNasani, Narendarpt_PT
dc.contributor.authorKovalevsky, Andrei V.pt_PT
dc.contributor.authorXie, Wenjiept_PT
dc.contributor.authorRasekh, Shahedpt_PT
dc.contributor.authorConstantinescu, Gabrielpt_PT
dc.contributor.authorWeidenkaff, Ankept_PT
dc.contributor.authorPukazhselvan, D.pt_PT
dc.contributor.authorFagg, Duncan P.pt_PT
dc.date.accessioned2020-08-11T15:45:17Z-
dc.date.issued2020-06-18-
dc.identifier.issn1932-7447pt_PT
dc.identifier.urihttp://hdl.handle.net/10773/29017-
dc.description.abstractEcobenign and high-temperature-stable oxides are considered a promising alternative to traditional Bi2Te3-, Bi2Se3-, and PbTe-based thermoelectric materials. The quest for high-performing thermoelectric oxides is still open and, among other challenges, includes the screening of various materials systems for potentially promising electrical and thermal transport properties. In this work, a new family of acceptor-substituted Haldane gap 1D BaGd2CoO5 dense ceramic materials was characterized in this respect. The substitution of this material with calcium results in a general improvement of the electrical performance, contributed by an interplay between the charge carrier concentration and their mobility. Nevertheless, a relatively low electrical conductivity was measured, reaching ∼5 S/cm at 1175 K, resulting in a maximum power factor of ∼25 μW/(K × m2) at 1173 K for BaGd1.80Ca0.20CoO5. On the other hand, the unique anisotropic 1D structure of the prepared materials promotes efficient phonon scattering, leading to low thermal conductivities, rarely observed in oxide electroceramics. While the BaGd2–xCaxCoO5 materials show attractive Seebeck coefficient values in the range 210–440 μV/K, the resulting dimensionless figure of merit is still relatively low, reaching ∼0.02 at 1173 K. The substituted BaGd2–xCaxCoO5 ceramics show comparable thermoelectric performance in both inert and air atmospheres. These features highlight the potential relevance of this structure type for thermoelectric applications, with future emphasis placed on methods to improve conductivity.pt_PT
dc.language.isoengpt_PT
dc.publisherAmerican Chemical Societypt_PT
dc.relationDST/INSPIRE/04/2017/003334pt_PT
dc.relationIF/01344/2014/CP1222/CT0001pt_PT
dc.relationPTDC/CTM-ENE/6319/2014pt_PT
dc.relationPOCI-01-0145-FEDER-032241pt_PT
dc.relationUID/EMS/00481/2019-FCTpt_PT
dc.relationCENTRO-01-0145-FEDER-022083-QRENpt_PT
dc.relationPOCI-01-0145-FEDER-031875pt_PT
dc.relationFCT-CEECIND/02608/2017pt_PT
dc.relationUIDB/50011/2020pt_PT
dc.relationUIDP/50011/2020pt_PT
dc.relationBA 4171/4-1pt_PT
dc.rightsopenAccesspt_PT
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectHaldane gappt_PT
dc.subjectThermal conductivitypt_PT
dc.subjectThermoelectricspt_PT
dc.subjectSeebeck coefficientpt_PT
dc.subjectFigure of meritpt_PT
dc.titleUnravelling the effects of calcium substitution in BaGd2CoO5 Haldane gap 1D material and its thermoelectric performancept_PT
dc.typearticlept_PT
dc.description.versionpublishedpt_PT
dc.peerreviewedyespt_PT
degois.publication.firstPage13017pt_PT
degois.publication.issue24pt_PT
degois.publication.lastPage13025pt_PT
degois.publication.titleThe Journal of Physical Chemistry Cpt_PT
degois.publication.volume124pt_PT
dc.date.embargo2021-06-18-
dc.identifier.doi10.1021/acs.jpcc.0c03149pt_PT
dc.identifier.essn1932-7455pt_PT
Appears in Collections:TEMA - Artigos
CICECO - Artigos
DEM - Artigos
DEMaC - Artigos

Files in This Item:
File Description SizeFormat 
JPCC_124_2020_13017_peer_rev.pdf1.77 MBAdobe PDFView/Open


FacebookTwitterLinkedIn
Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.