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

• Published in: Physica status solidi. A, Applications and materials science Applications and materials science, 2024-10, Vol.221 (20), p.n/a
• Main Authors: Gurgel, Kaio Jonathas Alencar, Alves Nogueira, Francisco Enilton, de Freitas, Daniel Barros, Costa do Nascimento, João Paulo, Abreu, Tallison Oliveira, de Oliveira Silva, Paulo Maria, do Carmo, Felipe Felix, Santos da Silva, Marcelo Antonio, Santos da Silva, Ronaldo, Sombra, Antonio Sergio Bezerra
• Format: Article
• Language: English
• Subjects: Ceramics; Chemical synthesis; dielectric properties; dielectric resonator antennas; Dielectrics; Electrical properties; Li2LaNbTiO7; microwave; Radio antennas; Radio frequency; Reflectance; Resonant frequencies; Resonators; Room temperature
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.202400480

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. The dielectric properties of Li2LaNbTiO7 (LLNT) ceramic matrix containing are investigated in radiofrequency (RF) and microwave region (MW). Moreover, it is also possible to evaluate the application of LLNT ceramic acting as a temperature sensor, whereas the calculated sensitivity is −0.13 MHz °C−1, which means that the LLNT could be applied as a temperature sensor.