Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.

Detalhes bibliográficos
Autor(a) principal: Dias, Anderson
Data de Publicação: 2017
Outros Autores: Siqueira, Kisla Prislen Félix, Moreira, Roberto Luiz
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/9591
https://doi.org/10.1016/j.jallcom.2016.10.077
Resumo: Lanthanide orthotantalates LnTaO4 (Ln ¼ La, Nd, Dy and Lu) were synthesized by solid-state reactions at 1300 C leading to well crystallized single-phase materials. XRD and infrared spectroscopic investigations showed that the samples exhibited three different monoclinic crystal structures depending on the lanthanide ion: P21/c (for La), I2/a (for Nd) and P2/a (for Dy and Lu). For LaTaO4, 21 polar modes could be depicted from the unpolarized infrared reflectivity spectrum, while group theory tools foreseen 33 infrared-active modes e the absent mode are likely hidden by accidental degeneracy. The smaller lanthanides (Nd, Dy and Lu) exhibited all the 15 predicted infrared-active bands, in perfect agreement with group-theory calculations, despite the mixing of polarization symmetry due to the polycrystalline nature of the samples. The intrinsic (infrared) dielectric properties were determined for all samples indicating that these orthotantalate ceramics could be candidates for microwave (MW) circuitry applications. LaTaO4 ceramics exhibited the best MWdielectric response among the investigated LnTaO4 ( 3 r ¼ 21.2 and estimated Qu f z 77 THz), followed by DyTaO4 ( 3 r ¼ 19.9 and Qu f z 75 THz), NdTaO4 ( 3 r ¼ 18.7 and Qu f z 55 THz), and LuTaO4 ( 3 r ¼ 16.2 and Qu f z 60 THz).
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spelling Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.CeramicsMicrowaveRare earthInfrared reflectivityLanthanide orthotantalates LnTaO4 (Ln ¼ La, Nd, Dy and Lu) were synthesized by solid-state reactions at 1300 C leading to well crystallized single-phase materials. XRD and infrared spectroscopic investigations showed that the samples exhibited three different monoclinic crystal structures depending on the lanthanide ion: P21/c (for La), I2/a (for Nd) and P2/a (for Dy and Lu). For LaTaO4, 21 polar modes could be depicted from the unpolarized infrared reflectivity spectrum, while group theory tools foreseen 33 infrared-active modes e the absent mode are likely hidden by accidental degeneracy. The smaller lanthanides (Nd, Dy and Lu) exhibited all the 15 predicted infrared-active bands, in perfect agreement with group-theory calculations, despite the mixing of polarization symmetry due to the polycrystalline nature of the samples. The intrinsic (infrared) dielectric properties were determined for all samples indicating that these orthotantalate ceramics could be candidates for microwave (MW) circuitry applications. LaTaO4 ceramics exhibited the best MWdielectric response among the investigated LnTaO4 ( 3 r ¼ 21.2 and estimated Qu f z 77 THz), followed by DyTaO4 ( 3 r ¼ 19.9 and Qu f z 75 THz), NdTaO4 ( 3 r ¼ 18.7 and Qu f z 55 THz), and LuTaO4 ( 3 r ¼ 16.2 and Qu f z 60 THz).2018-03-13T13:12:19Z2018-03-13T13:12:19Z2017info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfDIAS, A.; SIQUEIRA, K. P. F.; MOREIRA, R. L. Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry. Journal of Alloys and Compounds, v. 693, p. 1243-1249, fev. 2017. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0925838816331863> Acesso em: 15 set. 20170925-8388http://www.repositorio.ufop.br/handle/123456789/9591https://doi.org/10.1016/j.jallcom.2016.10.077O periódico Journal of Alloys and Compounds concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 4210810378039.info:eu-repo/semantics/openAccessDias, AndersonSiqueira, Kisla Prislen FélixMoreira, Roberto Luizengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOP2020-03-16T11:12:19Zoai:repositorio.ufop.br:123456789/9591Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332020-03-16T11:12:19Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.none.fl_str_mv Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.
title Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.
spellingShingle Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.
Dias, Anderson
Ceramics
Microwave
Rare earth
Infrared reflectivity
title_short Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.
title_full Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.
title_fullStr Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.
title_full_unstemmed Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.
title_sort Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.
author Dias, Anderson
author_facet Dias, Anderson
Siqueira, Kisla Prislen Félix
Moreira, Roberto Luiz
author_role author
author2 Siqueira, Kisla Prislen Félix
Moreira, Roberto Luiz
author2_role author
author
dc.contributor.author.fl_str_mv Dias, Anderson
Siqueira, Kisla Prislen Félix
Moreira, Roberto Luiz
dc.subject.por.fl_str_mv Ceramics
Microwave
Rare earth
Infrared reflectivity
topic Ceramics
Microwave
Rare earth
Infrared reflectivity
description Lanthanide orthotantalates LnTaO4 (Ln ¼ La, Nd, Dy and Lu) were synthesized by solid-state reactions at 1300 C leading to well crystallized single-phase materials. XRD and infrared spectroscopic investigations showed that the samples exhibited three different monoclinic crystal structures depending on the lanthanide ion: P21/c (for La), I2/a (for Nd) and P2/a (for Dy and Lu). For LaTaO4, 21 polar modes could be depicted from the unpolarized infrared reflectivity spectrum, while group theory tools foreseen 33 infrared-active modes e the absent mode are likely hidden by accidental degeneracy. The smaller lanthanides (Nd, Dy and Lu) exhibited all the 15 predicted infrared-active bands, in perfect agreement with group-theory calculations, despite the mixing of polarization symmetry due to the polycrystalline nature of the samples. The intrinsic (infrared) dielectric properties were determined for all samples indicating that these orthotantalate ceramics could be candidates for microwave (MW) circuitry applications. LaTaO4 ceramics exhibited the best MWdielectric response among the investigated LnTaO4 ( 3 r ¼ 21.2 and estimated Qu f z 77 THz), followed by DyTaO4 ( 3 r ¼ 19.9 and Qu f z 75 THz), NdTaO4 ( 3 r ¼ 18.7 and Qu f z 55 THz), and LuTaO4 ( 3 r ¼ 16.2 and Qu f z 60 THz).
publishDate 2017
dc.date.none.fl_str_mv 2017
2018-03-13T13:12:19Z
2018-03-13T13:12:19Z
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 DIAS, A.; SIQUEIRA, K. P. F.; MOREIRA, R. L. Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry. Journal of Alloys and Compounds, v. 693, p. 1243-1249, fev. 2017. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0925838816331863> Acesso em: 15 set. 2017
0925-8388
http://www.repositorio.ufop.br/handle/123456789/9591
https://doi.org/10.1016/j.jallcom.2016.10.077
identifier_str_mv DIAS, A.; SIQUEIRA, K. P. F.; MOREIRA, R. L. Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry. Journal of Alloys and Compounds, v. 693, p. 1243-1249, fev. 2017. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0925838816331863> Acesso em: 15 set. 2017
0925-8388
url http://www.repositorio.ufop.br/handle/123456789/9591
https://doi.org/10.1016/j.jallcom.2016.10.077
dc.language.iso.fl_str_mv eng
language eng
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 Institucional da UFOP
instname:Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
instname_str Universidade Federal de Ouro Preto (UFOP)
instacron_str UFOP
institution UFOP
reponame_str Repositório Institucional da UFOP
collection Repositório Institucional da UFOP
repository.name.fl_str_mv Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)
repository.mail.fl_str_mv repositorio@ufop.edu.br
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