Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system

Heterovalent B-site MgO substitution in the Nd2Zr2O7-system (Nd2Zr2−xMgxO7−x) has been explored. The pyrochlores were synthesized by a polymeric sol-gel method and characterized by X-ray diffraction (XRD), Raman spectroscopy and Scanning Electron Microscopy to determine structure, phase composition...

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Autores: Vendrell, Xavier, Santos-Veiga, E., Beltran-Mir, Héctor, Cordoncillo, Eloísa, Mestres i Vila, Ma. Lourdes
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/208269
Acceso en línea:https://hdl.handle.net/2445/208269
Access Level:acceso abierto
Palabra clave:Revestiments
Espectroscòpia Raman
Difracció de raigs X
Coatings
Raman spectroscopy
X-rays diffraction
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spelling Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore systemVendrell, XavierSantos-Veiga, E.Beltran-Mir, HéctorCordoncillo, EloísaMestres i Vila, Ma. LourdesRevestimentsEspectroscòpia RamanDifracció de raigs XCoatingsRaman spectroscopyX-rays diffractionHeterovalent B-site MgO substitution in the Nd2Zr2O7-system (Nd2Zr2−xMgxO7−x) has been explored. The pyrochlores were synthesized by a polymeric sol-gel method and characterized by X-ray diffraction (XRD), Raman spectroscopy and Scanning Electron Microscopy to determine structure, phase composition and microstructure. Impedance Spectroscopy (IS) was employed to study the electrical behavior of the ceramics over the ranges 200–800 °C and under pure N2 and O2. The XRD showed that the solid solution limit was x > 0.02 and all the materials show a cubic ̅ structure. The Raman results confirm the structural disorder created by the introduction of Mg2+ and the subsequent generation of oxygen vacancies. The IS data shows a dramatical increase of the oxide-ion conductivity when doping and that the conductivity depends strongly on the atmosphere, leading to p-type semiconductivity under pure O2 atmosphere. The present study highlights the use of heterovalent dopants to drastically increase the oxide-ion conductivity of pyrochlore-like materials.Elsevier B.V.2023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/208269Articles publicats en revistes (Química Inorgànica i Orgànica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/https://doi.org/10.1016/j.jeurceramsoc.2023.07.061Journal of the European Ceramic Society, 2023, vol. 43, num.15, p. 6967-6973https://doi.org/https://doi.org/10.1016/j.jeurceramsoc.2023.07.061cc-by-nc-nd (c) Vendrell, Xavier et al., 2023http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2082692026-05-27T06:46:51Z
dc.title.none.fl_str_mv Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system
title Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system
spellingShingle Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system
Vendrell, Xavier
Revestiments
Espectroscòpia Raman
Difracció de raigs X
Coatings
Raman spectroscopy
X-rays diffraction
title_short Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system
title_full Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system
title_fullStr Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system
title_full_unstemmed Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system
title_sort Induced p-type semiconductivity in Mg-doped Nd2Zr2O7 pyrochlore system
dc.creator.none.fl_str_mv Vendrell, Xavier
Santos-Veiga, E.
Beltran-Mir, Héctor
Cordoncillo, Eloísa
Mestres i Vila, Ma. Lourdes
author Vendrell, Xavier
author_facet Vendrell, Xavier
Santos-Veiga, E.
Beltran-Mir, Héctor
Cordoncillo, Eloísa
Mestres i Vila, Ma. Lourdes
author_role author
author2 Santos-Veiga, E.
Beltran-Mir, Héctor
Cordoncillo, Eloísa
Mestres i Vila, Ma. Lourdes
author2_role author
author
author
author
dc.subject.none.fl_str_mv Revestiments
Espectroscòpia Raman
Difracció de raigs X
Coatings
Raman spectroscopy
X-rays diffraction
topic Revestiments
Espectroscòpia Raman
Difracció de raigs X
Coatings
Raman spectroscopy
X-rays diffraction
description Heterovalent B-site MgO substitution in the Nd2Zr2O7-system (Nd2Zr2−xMgxO7−x) has been explored. The pyrochlores were synthesized by a polymeric sol-gel method and characterized by X-ray diffraction (XRD), Raman spectroscopy and Scanning Electron Microscopy to determine structure, phase composition and microstructure. Impedance Spectroscopy (IS) was employed to study the electrical behavior of the ceramics over the ranges 200–800 °C and under pure N2 and O2. The XRD showed that the solid solution limit was x > 0.02 and all the materials show a cubic ̅ structure. The Raman results confirm the structural disorder created by the introduction of Mg2+ and the subsequent generation of oxygen vacancies. The IS data shows a dramatical increase of the oxide-ion conductivity when doping and that the conductivity depends strongly on the atmosphere, leading to p-type semiconductivity under pure O2 atmosphere. The present study highlights the use of heterovalent dopants to drastically increase the oxide-ion conductivity of pyrochlore-like materials.
publishDate 2023
dc.date.none.fl_str_mv 2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/208269
url https://hdl.handle.net/2445/208269
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/https://doi.org/10.1016/j.jeurceramsoc.2023.07.061
Journal of the European Ceramic Society, 2023, vol. 43, num.15, p. 6967-6973
https://doi.org/https://doi.org/10.1016/j.jeurceramsoc.2023.07.061
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Vendrell, Xavier et al., 2023
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Vendrell, Xavier et al., 2023
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Química Inorgànica i Orgànica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.301603

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