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Observations of Co4+ in a Higher Spin State and the Increase in the Seebeck Coefficient of Thermoelectric Ca3Co4O9

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dc.contributor.authorsKlie, R. F.; Qiao, Q.; Paulauskas, T.; Gulec, A.; Rebola, A.; Oeguet, S.; Prange, M. P.; Idrobo, J. C.; Pantelides, S. T.; Kolesnik, S.; Dabrowski, B.; Ozdemir, M.; Boyraz, C.; Mazumdar, D.; Gupta, A.
dc.date.accessioned2022-03-14T10:17:57Z
dc.date.accessioned2026-01-10T18:50:02Z
dc.date.available2022-03-14T10:17:57Z
dc.date.issued2012-05-08
dc.description.abstractCa3Co4O9 has a unique structure that leads to exceptionally high thermoelectric transport. Here we report the achievement of a 27% increase in the room-temperature in-plane Seebeck coefficient of Ca3Co4O9 thin films. We combine aberration-corrected Z-contrast imaging, atomic-column resolved electron energy-loss spectroscopy, and density-functional calculations to show that the increase is caused by stacking faults with Co4+-ions in a higher spin state compared to that of bulk Ca3Co4O9. The higher Seebeck coefficient makes the Ca3Co4O9 system suitable for many high temperature waste-heat-recovery applications.
dc.identifier.doi10.1103/PhysRevLett.108.196601
dc.identifier.issn0031-9007
dc.identifier.pubmed23003068
dc.identifier.urihttps://hdl.handle.net/11424/244321
dc.identifier.wosWOS:000303761600014
dc.language.isoeng
dc.publisherAMER PHYSICAL SOC
dc.relation.ispartofPHYSICAL REVIEW LETTERS
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectSINGLE-CRYSTALS
dc.subjectTHIN-FILMS
dc.subjectTRANSPORT
dc.titleObservations of Co4+ in a Higher Spin State and the Increase in the Seebeck Coefficient of Thermoelectric Ca3Co4O9
dc.typearticle
dspace.entity.typePublication
oaire.citation.issue19
oaire.citation.titlePHYSICAL REVIEW LETTERS
oaire.citation.volume108

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