Unveiling the infrared complex dielectric function of ilmenite CdTiO3

Autor(es)

Rodrigues, Joao E. F. S. ^[1] ; Ferrer, Mateus M. ^[2] ; Moreira, Mario L. ^[2] ; Sambrano, Julio R. ^[3] ; Costa, Renilton C. ^[4] ; Rodrigues, Ariano D. ^[5] ; Pizani, Paulo S. ^[5] ; Huttel, Y. ^[1] ; Alonso, Jose A. ^[1] ; Pecharroman, Carlos ^[1]

Afiliação do(s) autor(es)

^[1] Inst Ciencia Mat Madrid, CSIC, C Sor Juana Ines de la Cruz 3, Madrid 28049 - Spain

^[2] Univ Fed Pelotas, Dept Phys, BR-96160000 Pelotas, RS - Brazil

^[3] Sao Paulo State Univ, Modeling & Mol Simulat Res Grp, UNESP, BR-17033360 Bauru, SP - Brazil

^[4] Univ Fed Campina Grande, Dept Environm Engn, BR-58840000 Pombal, PB - Brazil

^[5] Univ Fed Sao Carlos, Dept Phys, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 813, JAN 15 2020.
• Citações Web of Science: 0

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: epsilon(x)(s) similar to 27, epsilon(z)(s) similar to 20, and Q(u) x f similar to 111,000 GHz (at 10 GHz), enabling the ilmenite CdTiO3 material to be employed as central element in circuitry operating at IEEE X-band. (C) 2019 Published by Elsevier B.V. (AU)

• Processo FAPESP: 19/08928-9 - Modelagem e Simulações da Funcionalização de Nanotubos Porosos Inorgânicos
• Beneficiário: Julio Ricardo Sambrano
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs