<div class="csl-bib-body">
<div class="csl-entry">Durá, O. J., Boada, R., Rivera-Calzada, A., León, C., Bauer, E., de la Torre, M. A. L., & Chaboy, J. (2011). Transport, electronic, and structural properties of nanocrystalline CuAlO₂ delafossites. <i>Physical Review B</i>, <i>83</i>(045202). https://doi.org/10.1103/physrevb.83.045202</div>
</div>
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dc.identifier.issn
2469-9950
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/162877
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dc.description.abstract
This work reports on the effect of grain size on the electrical, thermal, and structural properties of CuAlO2 samples obtained by solid-state reaction combined with ball milling. Electrical characterization made in microcrystalline and nanocrystalline samples shows that the electrical conductivity decreases several orders of magnitude for the nanocrystalline samples, and, in addition, there is a large discrepancy between the activation energies associated to thermoelectric power ES. The study of the Cu K-edge x-ray absorption spectra of the CuAlO2 samples shows that the local structure around Cu is preserved after the sintering process, indicating that the observed behavior of the electrical conductivity is of intrinsic origin. Complex conductivity measurements as a function of frequency allow us to discard grain-boundaries effects on the electrical transport. Thus, the changes in σ(T) and S(T) are interpreted in terms of charge localization in the framework of small polarons. This is in agreement with the analysis of the near-edge region of the absorption spectra, which indicates that sintering favors the Cu-O hybridization. As a consequence, oxygen atoms progressively lose their capability of trapping holes, and the electrical conductivity is also enhanced.
en
dc.language.iso
en
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dc.publisher
AMER PHYSICAL SOC
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dc.relation.ispartof
Physical Review B
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dc.subject
Condensed Matter Physics
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dc.subject
Electronic, Optical and Magnetic Materials
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dc.title
Transport, electronic, and structural properties of nanocrystalline CuAlO₂ delafossites
en
dc.type
Artikel
de
dc.type
Article
en
dc.type.category
Original Research Article
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tuw.container.volume
83
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tuw.container.issue
045202
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tuw.journal.peerreviewed
true
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tuw.peerreviewed
true
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tuw.researchTopic.id
M8
-
tuw.researchTopic.id
M7
-
tuw.researchTopic.id
M3
-
tuw.researchTopic.id
M2
-
tuw.researchTopic.name
Structure-Property Relationship
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tuw.researchTopic.name
Special and Engineering Materials
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tuw.researchTopic.name
Metallic Materials
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.value
50
-
tuw.researchTopic.value
20
-
tuw.researchTopic.value
10
-
tuw.researchTopic.value
20
-
dcterms.isPartOf.title
Physical Review B
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tuw.publication.orgunit
E138-03 - Forschungsbereich Functional and Magnetic Materials
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tuw.publisher.doi
10.1103/physrevb.83.045202
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dc.identifier.eissn
2469-9969
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dc.description.numberOfPages
10
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wb.sci
true
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wb.sciencebranch
Physik, Mechanik, Astronomie
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wb.sciencebranch.oefos
12
-
wb.facultyfocus
Physik der Materie
de
wb.facultyfocus
Physics of Matter
en
wb.facultyfocus.faculty
E130
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item.languageiso639-1
en
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item.openairetype
research article
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item.grantfulltext
none
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item.fulltext
no Fulltext
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item.cerifentitytype
Publications
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item.openairecristype
http://purl.org/coar/resource_type/c_2df8fbb1
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crisitem.author.dept
E138-03 - Forschungsbereich Functional and Magnetic Materials