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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Unveiling the infrared complex dielectric function of ilmenite CdTiO3

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Author(s):
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]
Total Authors: 10
Affiliation:
[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
Total Affiliations: 5
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 813, JAN 15 2020.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 19/08928-9 - Modeling and simulations of porous inorganic nanotubes functionalization
Grantee:Julio Ricardo Sambrano
Support Opportunities: Regular Research Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC