DataVXphysica status solidi (a)Paper
journal article·2024-10

Improved Temperature Sensitivity of the Microwave and Radiofrequency Properties of the Ceramic Matrix Li2LaNbTiO7

Kaio Jonathas Alencar Gurgel, Francisco Enilton Alves Nogueira, Daniel Barros de Freitas, João Paulo Costa do Nascimento, Tallison Oliveira Abreu, Paulo Maria de Oliveira Silva, Felipe Felix do Carmo, Marcelo Antonio Santos da Silva, Ronaldo Santos da Silva, Antonio Sergio Bezerra Sombra

physica status solidi (a)· Volume 221· Issue 20
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Source abstract

Abstract

This study presents experimental investigations and numerical simulations of the microwave (MW) dielectric and evaluation of the electrical properties in the radiofrequency region (RF). The ceramic matrix Li2LaNbTiO7 (LLNT) is obtained through the solid‐state reaction method. The synthesis of LLNT is confirmed using the X‐ray diffraction technique. In the complex impedance spectroscopy study, permittivity (ε′r) and loss tangent (tanδ) values are analyzed at room temperature. The study of the conductivity spectrum at different temperatures demonstrates that the conduction process is thermally activated, presenting a value of 0.65 eV for the activation energy. Numerical simulations are employed to evaluate the behavior of the LLNT matrix as dielectric resonator antennas (DRA), whereas this ceramics demonstrated a reflection coefficient of less than −10 dB at the resonant frequency, achieving a gain of 3.71 dBi, a bandwidth of 144 MHz and a radiation efficiency greater than 97%. The results indicate that the LLNT matrix would be a promising candidate for RF and MW operating devices.
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Research context

Ceramics & glasses

OpenAlex topics: Microwave Dielectric Ceramics Synthesis · Ferroelectric and Piezoelectric Materials · Advanced ceramic materials synthesis

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Telecommunication Engineering Department Federal University of Ceará (UFC) P.O. Box 6007 Fortaleza Ceará 60755‐640 Brazil

Federal Institute of Education Science and Technology of Ceará (IFCE) Campus Maranguape Maranguape Ceará 61940‐750 Brazil

Telecommunication and Materials Science and Engineering of Laboratory (LOCEM) Physics Department Federal University of Ceará (UFC) Campus Pici Fortaleza 60040‐531 Ceará Brazil

Federal Institute of Education Science and Technology of Ceará (IFCE) PPGET Fortaleza 60040‐531 Ceará Brazil

Department of Organic and Inorganic Chemistry Federal University of Ceará (UFC) Fortaleza 60040‐531 Ceará Brazil

Federal Institute of Education Science and Technology of Ceará (IFCE) Campus Camocim Camocim Ceará 62400‐000 Brazil

Group Functional Nanomaterials Physics Department Federal University of Sergipe Sao Cristóvão SE 49100‐000 Brazil

Funding

Conselho Nacional de Desenvolvimento Científico e Tecnológico · Coordenação de Aperfeiçoamento de Pessoal de Nível Superior · Financiadora de Estudos e Projetos · Air Force Office of Scientific Research

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