Optical-vibration and intrinsic dielectric properties of low-k high-Q Zn2GeO4 ceramics

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dc.creatorJéssica Ivone Viegas
dc.creatorRoberto Luiz Moreira
dc.creatorAnderson Dias
dc.date.accessioned2023-12-20T14:26:19Z
dc.date.accessioned2025-09-09T01:17:52Z
dc.date.available2023-12-20T14:26:19Z
dc.date.issued2021
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.sponsorshipOutra Agência
dc.identifier.doihttps://doi.org/10.1016/j.jpcs.2020.109693
dc.identifier.issn0022-3697
dc.identifier.urihttps://hdl.handle.net/1843/62107
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofJournal of Physics and Chemistry of Solids
dc.rightsAcesso Restrito
dc.subjectSemicondutores policristalinos
dc.subjectMaterial cerâmico
dc.subjectDeterminação de tamanho de partícula
dc.subjectRaman, Efeito de
dc.subjectEspectroscopia de infravermelho
dc.subjectMicroondas
dc.subjectLuminescência
dc.subjectFotocatálise
dc.subject.otherZn2GeO4
dc.subject.otherCeramics
dc.subject.otherDispersion analysis
dc.subject.otherRaman scattering
dc.subject.otherInfrared spectroscopy
dc.titleOptical-vibration and intrinsic dielectric properties of low-k high-Q Zn2GeO4 ceramics
dc.typeArtigo de periódico
local.citation.spage109693
local.citation.volume148
local.description.resumoPolycrystalline Zn2GeO4 powders and sintered ceramics were prepared by the microwave–assisted solid-state reaction method. Structural, chemical, and morphological properties, as well as the optical-vibration features of the obtained materials, were investigated by XRD, scanning and transmission electron microscopies, polarized micro-Raman scattering, and infrared spectroscopy. Single-phase, high-purity, crystalline powders and ceramics belonging to the rhombohedral space group showed excellent polarized Raman response, which allowed us to determine and assign 39 gerade phonons out of the 42 optical modes predicted for Zn2GeO4 by group theory. Also, the 29 most relevant polar phonons (ungerade) of the sintered material were revealed and the dielectric strengths of the modes that contribute to the dielectric response were obtained. The infrared dispersion parameters allowed us to calculate the extrapolated dielectric constants = 7.02 and = 2.41, and an intrinsic quality factor Qu × f = 187 THz, at 10 GHz, values that are quite suitable for applications as low-k high-Q materials in microwave circuitry. The very comprehensive set of phonon modes obtained here should be useful for understanding the behavior of the material, needed to improve their already numerous optical applications (luminescence, photocatalysis).
local.identifier.orcidhttps://orcid.org/0000-0002-4865-5052
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
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/S0022369720312713

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