Unveiling the infrared complex dielectric function of ilmenite CdTiO3
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , , , , |
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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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 |
|
_version_ |
1808129599690768384 |