Abstract
In this article, the dielectric properties of the ceramic CaMoO4 (CMO) with additions of 0, 8, 12, and 20% by mass (wt %) of TiO2 in the radiofrequency (RF) region were studied. X-ray diffraction analysis showed that no secondary phases formed after the addition of TiO2. Scanning electron microscopy was used to analyse the effects on the morphology of the CMO. Complex Impedance Spectroscopy (CIS) was performed to evaluate the electrical properties of the materials, while temperature coefficient of capacitance (TCC) analysis showed that at 10 kHz, CMO12 (CMO with 12 wt % TiO2) presented a TCC equal to zero, demonstrating that this material is thermally stable at this frequency. The activation energy (Ea) was calculated by AC conductivity and imaginary part of the electric modulus (M″) at different temperatures. The Ea values were close, indicating that the thermally activated conduction process is the same. Moreover, the addition of TiO2 resulted in a decrease in the Ea, implying an increased conductivity of the material. The results obtained show that the materials evaluated would be interesting candidates for application in electronic circuits that operate in the radiofrequency region.
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Funding
This work was partly sponsored by the Brazilian Research Agencies CNPq-Conselho Nacional de Desenvolvimento Científico e Tecnológico (Grant INCT NANO(BIO)SIMES), CAPES—Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Grant Project PNPD), FINEP-Financiadora de Estudos e Projetos (Grant INFRAPESQ-11 and INFRAPESQ-12), and the U. S. Air Force Office of Scientific Research (AFOSR) (FA9550-16-1-0127).
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Authors statement for the manuscript entitled “High Thermal Stability of the Radiofrequency Dielectric Properties of the CaMoO4 Matrix with TiO2 Addition Under Temperature Variation”. All the authors participated in the work; however, some dedicated more time to some specific activities, which we describe below: Conceptualization—Francisco Enilton Alves Nogueira, Felipe Felix do Carmo. Methodology—Software—Francisco Enilton Alves Nogueira, Roterdan Fernandes Abreu. Validation—Di Zhou, C. Singh. Formal analysis—João Paulo Costa do Nascimento, Tallison Oliveira Abreu. Investigation—Anupama Ghosh, Roterdan Fernandes Abreu. Resources—Antonio Sergio Bezerra Sombra, Ronaldo Santos da Silva. Data curation—S. V. Trukhanov, Anupama Ghosh. Writing—original draft preparation—Francisco Enilton Alves Nogueira, João Paulo Costa do Nascimento. Writing—review and editing—Marcelo Antonio Santos da Silva, João Paulo Costa do Nascimento. Visualization—Francisco Enilton Alves Nogueira, Felipe Felix do Carmo. Supervision—Felipe Felix do Carmo, Marcelo Antonio Santos da Silva. Project administration—Ronaldo Santos da Silva, Antonio Sergio Bezerra Sombra. Funding acquisition—Antonio Sergio Bezerra Sombra.
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Nogueira, F.E.A., do Nascimento, J.P.C., Abreu, T.O. et al. Elevated thermal stability of the dielectric properties of CaMoO4–TiO2 composites under temperature variations. J Mater Sci: Mater Electron 35, 1470 (2024). https://doi.org/10.1007/s10854-024-13227-7
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DOI: https://doi.org/10.1007/s10854-024-13227-7