Non-stoichiometric mixed lead and tin niobates

Detalhes bibliográficos
Autor(a) principal: Cruz-Lopes, Luísa
Data de Publicação: 2004
Outros Autores: Savariault, J.-M, Morais, C.M, Fernandez, C, Pedrosa de Jesus, J.D, Rocha, J
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.19/7543
Resumo: Novel non-stoichiometric mixed lead and tin niobates with the pyrochlore structure have been synthesized via a solid-state route. The materials have been characterized by bulk chemical analysis, single-crystal and powder X-ray diffraction, 207Pb, 119Sn and 93Nb (single and triple quantum) solid-state NMR spectroscopy. The structures of the new non-stoichiometric mixed lead–tin niobate pyrochlore compounds have been Rietveld refined in the cubic system, space group Fd-3m. The steroactivity of the Sn(II) free electron pair leads to the general formula (Sn1.6−xPbx)(Nb2−ySny)O6.6−0.5y, where x (0–1.6) is the Pb(II) and y (0–0.34) is the Sn(IV) contents. 207Pb, 119Sn and (in particular) 93Nb NMR support the isomorphous substitution of tin for lead in the compounds studied. 93Nb triple-quantum magic-angle spinning NMR spectroscopy show that the materials contain, at least, two distinct niobium sites, in a 2:1 population ratio, which may be associated with different sample
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spelling Non-stoichiometric mixed lead and tin niobatesOxidesPyrochloreNiobatTinNovel non-stoichiometric mixed lead and tin niobates with the pyrochlore structure have been synthesized via a solid-state route. The materials have been characterized by bulk chemical analysis, single-crystal and powder X-ray diffraction, 207Pb, 119Sn and 93Nb (single and triple quantum) solid-state NMR spectroscopy. The structures of the new non-stoichiometric mixed lead–tin niobate pyrochlore compounds have been Rietveld refined in the cubic system, space group Fd-3m. The steroactivity of the Sn(II) free electron pair leads to the general formula (Sn1.6−xPbx)(Nb2−ySny)O6.6−0.5y, where x (0–1.6) is the Pb(II) and y (0–0.34) is the Sn(IV) contents. 207Pb, 119Sn and (in particular) 93Nb NMR support the isomorphous substitution of tin for lead in the compounds studied. 93Nb triple-quantum magic-angle spinning NMR spectroscopy show that the materials contain, at least, two distinct niobium sites, in a 2:1 population ratio, which may be associated with different sampleRepositório Científico do Instituto Politécnico de ViseuCruz-Lopes, LuísaSavariault, J.-MMorais, C.MFernandez, CPedrosa de Jesus, J.DRocha, J2023-01-13T11:12:51Z20042023-01-12T12:44:50Z2004-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.19/7543engCruz, L. P., Savariault, J.-M., Morais, C. M., Fernandez, C., Pedrosa de Jesus, J. D., & Rocha, J. (2004). Non-stoichiometric mixed lead and tin niobates. Journal of Solid State Chemistry, 177(4), 1549–1558. https://doi.org/10.1016/j.jssc.2003.12.0100022-4596cv-prod-150428410.1016/j.jssc.2003.12.0102-s2.0-1642462913info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-01-16T15:29:40Zoai:repositorio.ipv.pt:10400.19/7543Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:45:15.419286Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Non-stoichiometric mixed lead and tin niobates
title Non-stoichiometric mixed lead and tin niobates
spellingShingle Non-stoichiometric mixed lead and tin niobates
Cruz-Lopes, Luísa
Oxides
Pyrochlore
Niobat
Tin
title_short Non-stoichiometric mixed lead and tin niobates
title_full Non-stoichiometric mixed lead and tin niobates
title_fullStr Non-stoichiometric mixed lead and tin niobates
title_full_unstemmed Non-stoichiometric mixed lead and tin niobates
title_sort Non-stoichiometric mixed lead and tin niobates
author Cruz-Lopes, Luísa
author_facet Cruz-Lopes, Luísa
Savariault, J.-M
Morais, C.M
Fernandez, C
Pedrosa de Jesus, J.D
Rocha, J
author_role author
author2 Savariault, J.-M
Morais, C.M
Fernandez, C
Pedrosa de Jesus, J.D
Rocha, J
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório Científico do Instituto Politécnico de Viseu
dc.contributor.author.fl_str_mv Cruz-Lopes, Luísa
Savariault, J.-M
Morais, C.M
Fernandez, C
Pedrosa de Jesus, J.D
Rocha, J
dc.subject.por.fl_str_mv Oxides
Pyrochlore
Niobat
Tin
topic Oxides
Pyrochlore
Niobat
Tin
description Novel non-stoichiometric mixed lead and tin niobates with the pyrochlore structure have been synthesized via a solid-state route. The materials have been characterized by bulk chemical analysis, single-crystal and powder X-ray diffraction, 207Pb, 119Sn and 93Nb (single and triple quantum) solid-state NMR spectroscopy. The structures of the new non-stoichiometric mixed lead–tin niobate pyrochlore compounds have been Rietveld refined in the cubic system, space group Fd-3m. The steroactivity of the Sn(II) free electron pair leads to the general formula (Sn1.6−xPbx)(Nb2−ySny)O6.6−0.5y, where x (0–1.6) is the Pb(II) and y (0–0.34) is the Sn(IV) contents. 207Pb, 119Sn and (in particular) 93Nb NMR support the isomorphous substitution of tin for lead in the compounds studied. 93Nb triple-quantum magic-angle spinning NMR spectroscopy show that the materials contain, at least, two distinct niobium sites, in a 2:1 population ratio, which may be associated with different sample
publishDate 2004
dc.date.none.fl_str_mv 2004
2004-01-01T00:00:00Z
2023-01-13T11:12:51Z
2023-01-12T12:44:50Z
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://hdl.handle.net/10400.19/7543
url http://hdl.handle.net/10400.19/7543
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Cruz, L. P., Savariault, J.-M., Morais, C. M., Fernandez, C., Pedrosa de Jesus, J. D., & Rocha, J. (2004). Non-stoichiometric mixed lead and tin niobates. Journal of Solid State Chemistry, 177(4), 1549–1558. https://doi.org/10.1016/j.jssc.2003.12.010
0022-4596
cv-prod-1504284
10.1016/j.jssc.2003.12.010
2-s2.0-1642462913
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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