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
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , |
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. |
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Repositório Institucional da UNESP |
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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:29462024-08-05T17:12:05.959725Repositório 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_ |
1808128770227306496 |