Micro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry.
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , |
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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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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1813002816355041280 |