Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3

CaZrO3 nanoparticles were obtained by a new synthesis route: nucleation using the microwave-assisted hydrothermal method (MAH) and crystallization by heat treatment. Structural characterization by X-ray diffraction (XRD) was performed for the synthesized material and after heat treatment at 700, 800...

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Detalles Bibliográficos
Autores: Macedo, Wagner D. [UNESP], Souza, Agda E. [UNESP], Santos, Gleyson T.A. [UNESP], Teixeira, Silvio R. [UNESP], Longo, Elson
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:Brasil
Institución:Universidade Estadual Paulista (UNESP)
Repositorio:Repositório Institucional da UNESP
Idioma:inglés
OAI Identifier:oai:repositorio.unesp.br:11449/170230
Acceso en línea:http://dx.doi.org/10.1016/j.ceramint.2017.10.028
http://hdl.handle.net/11449/170230
Access Level:acceso abierto
Palabra clave:CaZrO3
Heat treatment
Hydrothermal
Microwave
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spelling Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3CaZrO3Heat treatmentHydrothermalMicrowaveCaZrO3 nanoparticles were obtained by a new synthesis route: nucleation using the microwave-assisted hydrothermal method (MAH) and crystallization by heat treatment. Structural characterization by X-ray diffraction (XRD) was performed for the synthesized material and after heat treatment at 700, 800, 900, 1000 and 1200 °C. At 800 °C, the lakargite phase crystallization (CaZrO3) starts and portions of the non-stoichiometric calcium-zirconium oxide phase were observed by XRD and Raman spectroscopy. A residual CaCO3 phase was present in the untreated samples. At 1200 °C, the well-crystallized stoichiometric and non-stoichiometric mixed oxide phases of CaZrO3 (crystallites of about 75 nm) were observed, along with particle agglomerates often in the micrometer range. The synthesized material was subjected to differential thermal analysis, which revealed carbonate degradation at approximately 695 °C, resulting in a small loss of mass of 6%. An endothermic reaction at 85 °C was observed for water loss, where there was a considerable amount of energy involved. This result showed the sensitivity to moisture absorption and adsorption processes of the CaZrO3 sample, obtained by the MAH route. UV–Vis spectroscopy showed the characteristic gap energies for the two phases, which were 2.9 (non-stoichiometric) and 4.9 eV (stoichiometric), values smaller than those obtained by usual synthesis routes.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)São Paulo State University (UNESP) Dept. of PhysicsFederal University of São Carlos (UFSCar) CDMF/CEPIDSão Paulo State University (UNESP) Dept. of PhysicsCNPq: 573636/2008-7Universidade Estadual Paulista (Unesp)Universidade Federal de São Carlos (UFSCar)2018-12-11T16:49:51Z2018-12-11T16:49:51Z2018-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article953-958application/pdfhttp://dx.doi.org/10.1016/j.ceramint.2017.10.028Ceramics International, v. 44, n. 1, p. 953-958, 2018.0272-8842http://hdl.handle.net/11449/17023010.1016/j.ceramint.2017.10.0282-s2.0-850306428952-s2.0-85030642895.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengCeramics International0,784info:eu-repo/semantics/openAccessMacedo, Wagner D. [UNESP]Souza, Agda E. [UNESP]Santos, Gleyson T.A. [UNESP]Teixeira, Silvio R. [UNESP]Longo, Elson2024-01-02T06:21:45Zoai:repositorio.unesp.br:11449/170230Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestrepositoriounesp@unesp.bropendoar:29462024-01-02T06:21:45Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3
title Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3
spellingShingle Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3
Macedo, Wagner D. [UNESP]
CaZrO3
Heat treatment
Hydrothermal
Microwave
title_short Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3
title_full Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3
title_fullStr Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3
title_full_unstemmed Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3
title_sort Microwave-assisted hydrothermal synthesis followed by heat treatment: A new route to obtain CaZrO3
dc.creator.none.fl_str_mv Macedo, Wagner D. [UNESP]
Souza, Agda E. [UNESP]
Santos, Gleyson T.A. [UNESP]
Teixeira, Silvio R. [UNESP]
Longo, Elson
author Macedo, Wagner D. [UNESP]
author_facet Macedo, Wagner D. [UNESP]
Souza, Agda E. [UNESP]
Santos, Gleyson T.A. [UNESP]
Teixeira, Silvio R. [UNESP]
Longo, Elson
author_role author
author2 Souza, Agda E. [UNESP]
Santos, Gleyson T.A. [UNESP]
Teixeira, Silvio R. [UNESP]
Longo, Elson
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Universidade Federal de São Carlos (UFSCar)
dc.subject.por.fl_str_mv CaZrO3
Heat treatment
Hydrothermal
Microwave
topic CaZrO3
Heat treatment
Hydrothermal
Microwave
description CaZrO3 nanoparticles were obtained by a new synthesis route: nucleation using the microwave-assisted hydrothermal method (MAH) and crystallization by heat treatment. Structural characterization by X-ray diffraction (XRD) was performed for the synthesized material and after heat treatment at 700, 800, 900, 1000 and 1200 °C. At 800 °C, the lakargite phase crystallization (CaZrO3) starts and portions of the non-stoichiometric calcium-zirconium oxide phase were observed by XRD and Raman spectroscopy. A residual CaCO3 phase was present in the untreated samples. At 1200 °C, the well-crystallized stoichiometric and non-stoichiometric mixed oxide phases of CaZrO3 (crystallites of about 75 nm) were observed, along with particle agglomerates often in the micrometer range. The synthesized material was subjected to differential thermal analysis, which revealed carbonate degradation at approximately 695 °C, resulting in a small loss of mass of 6%. An endothermic reaction at 85 °C was observed for water loss, where there was a considerable amount of energy involved. This result showed the sensitivity to moisture absorption and adsorption processes of the CaZrO3 sample, obtained by the MAH route. UV–Vis spectroscopy showed the characteristic gap energies for the two phases, which were 2.9 (non-stoichiometric) and 4.9 eV (stoichiometric), values smaller than those obtained by usual synthesis routes.
publishDate 2018
dc.date.none.fl_str_mv 2018-12-11T16:49:51Z
2018-12-11T16:49:51Z
2018-01-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.ceramint.2017.10.028
Ceramics International, v. 44, n. 1, p. 953-958, 2018.
0272-8842
http://hdl.handle.net/11449/170230
10.1016/j.ceramint.2017.10.028
2-s2.0-85030642895
2-s2.0-85030642895.pdf
url http://dx.doi.org/10.1016/j.ceramint.2017.10.028
http://hdl.handle.net/11449/170230
identifier_str_mv Ceramics International, v. 44, n. 1, p. 953-958, 2018.
0272-8842
10.1016/j.ceramint.2017.10.028
2-s2.0-85030642895
2-s2.0-85030642895.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Ceramics International
0,784
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 953-958
application/pdf
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv repositoriounesp@unesp.br
_version_ 1853672278065152000
score 15.300724

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