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

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dc.creatorAnderson Dias
dc.creatorKisla Prislen Félix Siqueira
dc.creatorRoberto Luiz Moreira
dc.date.accessioned2023-07-31T13:50:39Z
dc.date.accessioned2025-09-09T01:29:52Z
dc.date.available2023-07-31T13:50:39Z
dc.date.issued2017
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetos
dc.identifier.doihttps://doi.org/10.1016/j.jallcom.2016.10.077
dc.identifier.issn0925-8388
dc.identifier.urihttps://hdl.handle.net/1843/57218
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofJournal of Alloys and Compounds
dc.rightsAcesso Restrito
dc.subjectCompostos de lantânio
dc.subjectMaterial cerâmico
dc.subjectEspectroscopia de infravermelho
dc.subjectCompostos de metais de terras raras
dc.subjectCircuitos de microondas
dc.subjectDispositivos dielétricos
dc.subject.otherCeramics
dc.subject.otherInfrared reflectivity
dc.subject.otherRare earth
dc.subject.otherMicrowave
dc.subject.otherDielectric resonators
dc.subject.otherOrthotantalates
dc.titleMicro far-infrared dielectric response of lanthanide orthotantalates for applications in microwave circuitry
dc.typeArtigo de periódico
local.citation.epage1249
local.citation.spage1243
local.citation.volume693
local.description.resumoLanthanide orthotantalates LnTaO4 (Ln = 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 – 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 MW dielectric response among the investigated LnTaO4 (ɛr = 21.2 and estimated Qu × f ≈ 77 THz), followed by DyTaO4 (ɛr = 19.9 and Qu × f ≈ 75 THz), NdTaO4 (ɛr = 18.7 and Qu × f ≈ 55 THz), and LuTaO4 (ɛr = 16.2 and Qu × f ≈ 60 THz).
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.identifier.orcidhttps://orcid.org/0000-0002-6344-3103
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0925838816331863

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