Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramics

A combined powder X-ray lattice parameter and ceramic impedance spectroscopy study is presented on materials within the CaO–CuO–TiO_(2) ternary phase diagram. Several compositions containing CaCu_(3)Ti_(4)O_(12) (CCTO) and small amounts of secondary phases such as TiO_(2), CaTiO_(3) and CuO are anal...

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Authors: Schmidt, Rainer, Pandey, Shubhra, Fiorenza, Patrick, Sinclair, Darek C.
Format: article
Publication Date:2013
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/44704
Online Access:https://hdl.handle.net/20.500.14352/44704
Access Level:Open access
Keyword:537
Giant dielectric-constant
Barrier layer capacitor
Effective ionic-radii
Copper-titanate
Oxide
Perovskites
Conduction
Fluorides.
Electricidad
Electrónica (Física)
2202.03 Electricidad
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oai_identifier_str oai:docta.ucm.es:20.500.14352/44704
network_acronym_str ES
network_name_str España
repository_id_str
spelling Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramicsSchmidt, RainerPandey, ShubhraFiorenza, PatrickSinclair, Darek C.537Giant dielectric-constantBarrier layer capacitorEffective ionic-radiiCopper-titanateOxidePerovskitesConductionFluorides.ElectricidadElectrónica (Física)2202.03 ElectricidadA combined powder X-ray lattice parameter and ceramic impedance spectroscopy study is presented on materials within the CaO–CuO–TiO_(2) ternary phase diagram. Several compositions containing CaCu_(3)Ti_(4)O_(12) (CCTO) and small amounts of secondary phases such as TiO_(2), CaTiO_(3) and CuO are analysed and two different defect mechanisms are identified as the cause of the non-stoichiometry in CCTO. The first mechanism involves a variation in the Cu content, which explains the large differences in the intrinsic bulk and extrinsic grain boundary (GB) resistance, and the formation of the ceramic internal barrier layer capacitor (IBLC) structure. The second mechanism is associated with Ca–Cu anti-site disorder causing an unusually high intrinsic bulk permittivity above that predicted from Clausius–Mossotti calculations.RSCUniversidad Complutense de Madrid20132013-01-0120132013-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/44704reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/447042026-06-02T12:44:21Z
dc.title.none.fl_str_mv Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramics
title Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramics
spellingShingle Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramics
Schmidt, Rainer
537
Giant dielectric-constant
Barrier layer capacitor
Effective ionic-radii
Copper-titanate
Oxide
Perovskites
Conduction
Fluorides.
Electricidad
Electrónica (Física)
2202.03 Electricidad
title_short Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramics
title_full Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramics
title_fullStr Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramics
title_full_unstemmed Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramics
title_sort Non-stoichiometry in "CaCu_(3)Ti_(4)O_(12)" (CCTO) ceramics
dc.creator.none.fl_str_mv Schmidt, Rainer
Pandey, Shubhra
Fiorenza, Patrick
Sinclair, Darek C.
author Schmidt, Rainer
author_facet Schmidt, Rainer
Pandey, Shubhra
Fiorenza, Patrick
Sinclair, Darek C.
author_role author
author2 Pandey, Shubhra
Fiorenza, Patrick
Sinclair, Darek C.
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 537
Giant dielectric-constant
Barrier layer capacitor
Effective ionic-radii
Copper-titanate
Oxide
Perovskites
Conduction
Fluorides.
Electricidad
Electrónica (Física)
2202.03 Electricidad
topic 537
Giant dielectric-constant
Barrier layer capacitor
Effective ionic-radii
Copper-titanate
Oxide
Perovskites
Conduction
Fluorides.
Electricidad
Electrónica (Física)
2202.03 Electricidad
description A combined powder X-ray lattice parameter and ceramic impedance spectroscopy study is presented on materials within the CaO–CuO–TiO_(2) ternary phase diagram. Several compositions containing CaCu_(3)Ti_(4)O_(12) (CCTO) and small amounts of secondary phases such as TiO_(2), CaTiO_(3) and CuO are analysed and two different defect mechanisms are identified as the cause of the non-stoichiometry in CCTO. The first mechanism involves a variation in the Cu content, which explains the large differences in the intrinsic bulk and extrinsic grain boundary (GB) resistance, and the formation of the ceramic internal barrier layer capacitor (IBLC) structure. The second mechanism is associated with Ca–Cu anti-site disorder causing an unusually high intrinsic bulk permittivity above that predicted from Clausius–Mossotti calculations.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-01-01
2013
2013-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/44704
url https://hdl.handle.net/20.500.14352/44704
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv RSC
publisher.none.fl_str_mv RSC
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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