Unveiling the infrared complex dielectric function of ilmenite CdTiO3

Detalhes bibliográficos
Autor(a) principal: Rodrigues, João E.F.S.
Data de Publicação: 2020
Outros Autores: Ferrer, Mateus M., Moreira, Mario L., Sambrano, Julio R. [UNESP], Costa, Renilton C., Rodrigues, Ariano D., Pizani, Paulo S., Huttel, Y., Alonso, José A., Pecharromán, Carlos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.jallcom.2019.152136
http://hdl.handle.net/11449/197935
Resumo: This work presents the infrared active modes of the ilmenite phase of CdTiO3. Since the ilmenite phase of cadmium titanate is unstable in large particle size, the dielectric tensor at the infrared region has been extracted from near normal reflectance of highly reflecting cold pressed powder pellets. The microscopic values of each tensor component were deduced by a new formulation of the effective medium model suitable for anisotropic compacts. This model explicitly takes into account both the matrix and void percolation thresholds, in order to properly determine the dielectric tensor at the region of high frequency longitudinal modes. Both, reflection and absorption experimental data are been confronted with theoretical calculations based on the density functional theory, revealing a great convergence of the values. Additionally, we estimated the quality factor in the microwave region to be: εsx ∼27, εsz ∼20, and Qu × f ∼111,000 GHz (at 10 GHz), enabling the ilmenite CdTiO3 material to be employed as central element in circuitry operating at IEEE X-band.
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spelling Unveiling the infrared complex dielectric function of ilmenite CdTiO3CdTiO3Effective medium theoryIlmeniteInfrared reflectivityLattice dynamicsMicrowave dielectricsThis work presents the infrared active modes of the ilmenite phase of CdTiO3. Since the ilmenite phase of cadmium titanate is unstable in large particle size, the dielectric tensor at the infrared region has been extracted from near normal reflectance of highly reflecting cold pressed powder pellets. The microscopic values of each tensor component were deduced by a new formulation of the effective medium model suitable for anisotropic compacts. This model explicitly takes into account both the matrix and void percolation thresholds, in order to properly determine the dielectric tensor at the region of high frequency longitudinal modes. Both, reflection and absorption experimental data are been confronted with theoretical calculations based on the density functional theory, revealing a great convergence of the values. Additionally, we estimated the quality factor in the microwave region to be: εsx ∼27, εsz ∼20, and Qu × f ∼111,000 GHz (at 10 GHz), enabling the ilmenite CdTiO3 material to be employed as central element in circuitry operating at IEEE X-band.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Instituto de Ciencia de Materiales de Madrid Consejo Superior de Investigaciones Cientificas, C/ Sor Juana Inés de la Cruz, 3Department of Physics Federal University of PelotasModeling and Molecular Simulations Research Group São Paulo State University UNESPDepartment of Environmental Engineering Federal University of Campina GrandeDepartment of Physics Federal University of São CarlosModeling and Molecular Simulations Research Group São Paulo State University UNESPFAPESP: 2013/07296-2FAPESP: 2013/07793-6FAPESP: 2019/08928-9CNPq: 432242/2018-0CAPES: 88881.171031/2018-01Consejo Superior de Investigaciones CientificasFederal University of PelotasUniversidade Estadual Paulista (Unesp)Federal University of Campina GrandeUniversidade Federal de São Carlos (UFSCar)Rodrigues, João E.F.S.Ferrer, Mateus M.Moreira, Mario L.Sambrano, Julio R. [UNESP]Costa, Renilton C.Rodrigues, Ariano D.Pizani, Paulo S.Huttel, Y.Alonso, José A.Pecharromán, Carlos2020-12-12T00:54:33Z2020-12-12T00:54:33Z2020-01-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.jallcom.2019.152136Journal of Alloys and Compounds, v. 813.0925-8388http://hdl.handle.net/11449/19793510.1016/j.jallcom.2019.1521362-s2.0-85072046196Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Alloys and Compoundsinfo:eu-repo/semantics/openAccess2021-10-23T07:14:25Zoai:repositorio.unesp.br:11449/197935Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-06T00:14:35.450478Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Unveiling the infrared complex dielectric function of ilmenite CdTiO3
title Unveiling the infrared complex dielectric function of ilmenite CdTiO3
spellingShingle Unveiling the infrared complex dielectric function of ilmenite CdTiO3
Rodrigues, João E.F.S.
CdTiO3
Effective medium theory
Ilmenite
Infrared reflectivity
Lattice dynamics
Microwave dielectrics
title_short Unveiling the infrared complex dielectric function of ilmenite CdTiO3
title_full Unveiling the infrared complex dielectric function of ilmenite CdTiO3
title_fullStr Unveiling the infrared complex dielectric function of ilmenite CdTiO3
title_full_unstemmed Unveiling the infrared complex dielectric function of ilmenite CdTiO3
title_sort Unveiling the infrared complex dielectric function of ilmenite CdTiO3
author Rodrigues, João E.F.S.
author_facet Rodrigues, João E.F.S.
Ferrer, Mateus M.
Moreira, Mario L.
Sambrano, Julio R. [UNESP]
Costa, Renilton C.
Rodrigues, Ariano D.
Pizani, Paulo S.
Huttel, Y.
Alonso, José A.
Pecharromán, Carlos
author_role author
author2 Ferrer, Mateus M.
Moreira, Mario L.
Sambrano, Julio R. [UNESP]
Costa, Renilton C.
Rodrigues, Ariano D.
Pizani, Paulo S.
Huttel, Y.
Alonso, José A.
Pecharromán, Carlos
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Cientificas
Federal University of Pelotas
Universidade Estadual Paulista (Unesp)
Federal University of Campina Grande
Universidade Federal de São Carlos (UFSCar)
dc.contributor.author.fl_str_mv Rodrigues, João E.F.S.
Ferrer, Mateus M.
Moreira, Mario L.
Sambrano, Julio R. [UNESP]
Costa, Renilton C.
Rodrigues, Ariano D.
Pizani, Paulo S.
Huttel, Y.
Alonso, José A.
Pecharromán, Carlos
dc.subject.por.fl_str_mv CdTiO3
Effective medium theory
Ilmenite
Infrared reflectivity
Lattice dynamics
Microwave dielectrics
topic CdTiO3
Effective medium theory
Ilmenite
Infrared reflectivity
Lattice dynamics
Microwave dielectrics
description This work presents the infrared active modes of the ilmenite phase of CdTiO3. Since the ilmenite phase of cadmium titanate is unstable in large particle size, the dielectric tensor at the infrared region has been extracted from near normal reflectance of highly reflecting cold pressed powder pellets. The microscopic values of each tensor component were deduced by a new formulation of the effective medium model suitable for anisotropic compacts. This model explicitly takes into account both the matrix and void percolation thresholds, in order to properly determine the dielectric tensor at the region of high frequency longitudinal modes. Both, reflection and absorption experimental data are been confronted with theoretical calculations based on the density functional theory, revealing a great convergence of the values. Additionally, we estimated the quality factor in the microwave region to be: εsx ∼27, εsz ∼20, and Qu × f ∼111,000 GHz (at 10 GHz), enabling the ilmenite CdTiO3 material to be employed as central element in circuitry operating at IEEE X-band.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-12T00:54:33Z
2020-12-12T00:54:33Z
2020-01-15
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://dx.doi.org/10.1016/j.jallcom.2019.152136
Journal of Alloys and Compounds, v. 813.
0925-8388
http://hdl.handle.net/11449/197935
10.1016/j.jallcom.2019.152136
2-s2.0-85072046196
url http://dx.doi.org/10.1016/j.jallcom.2019.152136
http://hdl.handle.net/11449/197935
identifier_str_mv Journal of Alloys and Compounds, v. 813.
0925-8388
10.1016/j.jallcom.2019.152136
2-s2.0-85072046196
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Alloys and Compounds
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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