Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol method

Detalhes bibliográficos
Autor(a) principal: Namikuchi, Eliane Ayumi [UNESP]
Data de Publicação: 2015
Outros Autores: Lima Nobre, Marcos Augusto [UNESP], Lanfredi, Silvania [UNESP]
Tipo de documento: Artigo de conferência
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.4028/www.scientific.net/MSF.820.361
http://hdl.handle.net/11449/168329
Resumo: Niobates with tetragonal tungsten bronze TTB-type structure have presented great technological potential due to their dielectric, ferroelectric, pyroelectric properties. The preparation by the modified polyol method and structural characterization of K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0; 0. 0025; 0. 025; 0. 05 e 0. 1, were investigated. The structural parameters were analyzed as a function of concentration of europium ions in the K2NdNb5O15 host structure using the Rietveld method. From structural parameters was determined the TTB-type structure with tetragonal symmetry, where the pentagonal sites is occupied by K+ and Eu3+ ions and tetragonal sites is occupied only by Nd3+ ions. The addition of europium in the host structure led to a decrease in the lattice parameters, compatible with the increasing degree of distortion of NbO6 polyhedra. The average crystallite size showed values between 18. 25 and 26nm.
id UNSP_0fb10558c98f2322b728e11fd2ebeb14
oai_identifier_str oai:repositorio.unesp.br:11449/168329
network_acronym_str UNSP
network_name_str Repositório Institucional da UNESP
repository_id_str 2946
spelling Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol methodNiobatesRietveld refinementStructural characterizationNiobates with tetragonal tungsten bronze TTB-type structure have presented great technological potential due to their dielectric, ferroelectric, pyroelectric properties. The preparation by the modified polyol method and structural characterization of K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0; 0. 0025; 0. 025; 0. 05 e 0. 1, were investigated. The structural parameters were analyzed as a function of concentration of europium ions in the K2NdNb5O15 host structure using the Rietveld method. From structural parameters was determined the TTB-type structure with tetragonal symmetry, where the pentagonal sites is occupied by K+ and Eu3+ ions and tetragonal sites is occupied only by Nd3+ ions. The addition of europium in the host structure led to a decrease in the lattice parameters, compatible with the increasing degree of distortion of NbO6 polyhedra. The average crystallite size showed values between 18. 25 and 26nm.Laboratório de Compósitos e Cerâmicas Funcionais- LaCCeF Univ Estadual Paulista – UNESP, P. O Box 467Laboratório de Compósitos e Cerâmicas Funcionais- LaCCeF Univ Estadual Paulista – UNESP, P. O Box 467Universidade Estadual Paulista (Unesp)Namikuchi, Eliane Ayumi [UNESP]Lima Nobre, Marcos Augusto [UNESP]Lanfredi, Silvania [UNESP]2018-12-11T16:40:48Z2018-12-11T16:40:48Z2015-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject361-366application/pdfhttp://dx.doi.org/10.4028/www.scientific.net/MSF.820.361Materials Science Forum, v. 820, p. 361-366.0255-5476http://hdl.handle.net/11449/16832910.4028/www.scientific.net/MSF.820.3612-s2.0-849555117262-s2.0-84955511726.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMaterials Science Forum0,180info:eu-repo/semantics/openAccess2023-11-08T06:15:55Zoai:repositorio.unesp.br:11449/168329Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-11-08T06:15:55Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol method
title Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol method
spellingShingle Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol method
Namikuchi, Eliane Ayumi [UNESP]
Niobates
Rietveld refinement
Structural characterization
title_short Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol method
title_full Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol method
title_fullStr Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol method
title_full_unstemmed Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol method
title_sort Selective occupancy of sites by rare earths in K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0, 0. 0025, 0. 025, 0. 05 and 0. 1, prepared by modified polyol method
author Namikuchi, Eliane Ayumi [UNESP]
author_facet Namikuchi, Eliane Ayumi [UNESP]
Lima Nobre, Marcos Augusto [UNESP]
Lanfredi, Silvania [UNESP]
author_role author
author2 Lima Nobre, Marcos Augusto [UNESP]
Lanfredi, Silvania [UNESP]
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Namikuchi, Eliane Ayumi [UNESP]
Lima Nobre, Marcos Augusto [UNESP]
Lanfredi, Silvania [UNESP]
dc.subject.por.fl_str_mv Niobates
Rietveld refinement
Structural characterization
topic Niobates
Rietveld refinement
Structural characterization
description Niobates with tetragonal tungsten bronze TTB-type structure have presented great technological potential due to their dielectric, ferroelectric, pyroelectric properties. The preparation by the modified polyol method and structural characterization of K2Nd(1-x)EuxNb5O15 nanopowders, where x = 0; 0. 0025; 0. 025; 0. 05 e 0. 1, were investigated. The structural parameters were analyzed as a function of concentration of europium ions in the K2NdNb5O15 host structure using the Rietveld method. From structural parameters was determined the TTB-type structure with tetragonal symmetry, where the pentagonal sites is occupied by K+ and Eu3+ ions and tetragonal sites is occupied only by Nd3+ ions. The addition of europium in the host structure led to a decrease in the lattice parameters, compatible with the increasing degree of distortion of NbO6 polyhedra. The average crystallite size showed values between 18. 25 and 26nm.
publishDate 2015
dc.date.none.fl_str_mv 2015-01-01
2018-12-11T16:40:48Z
2018-12-11T16:40:48Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/conferenceObject
format conferenceObject
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.4028/www.scientific.net/MSF.820.361
Materials Science Forum, v. 820, p. 361-366.
0255-5476
http://hdl.handle.net/11449/168329
10.4028/www.scientific.net/MSF.820.361
2-s2.0-84955511726
2-s2.0-84955511726.pdf
url http://dx.doi.org/10.4028/www.scientific.net/MSF.820.361
http://hdl.handle.net/11449/168329
identifier_str_mv Materials Science Forum, v. 820, p. 361-366.
0255-5476
10.4028/www.scientific.net/MSF.820.361
2-s2.0-84955511726
2-s2.0-84955511726.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Materials Science Forum
0,180
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 361-366
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
_version_ 1803046388016087040

Registros relacionados