Abstract
The present work shows the dielectric properties of (100-X)Ba2TiSi2O8–(X)TiO2 composites (X in wt%) at radio frequency (RF) region (< 300 MHz). X-ray diffraction and Rietveld’s refinement showed the presence of Ba2(Ti7/9Si2/9)9O20 (BTSO) phase in the studied composites. To analyze the relationship between the electrical properties and the microstructure of the matrix and composites, Impedance spectroscopy (IS) was used. The applied model that best describes the behavior found in the samples is the Havriliak–Negami model. From the IS it was observed that the dielectric relative permittivity presented high values in BTS10 (X = 10%) and BTS20 (X = 20%) which allows classifying them as Colossal permittivity materials. This is an important result due to the potential for applications in new storage systems, capacitive devices and microelectronics. Nyquist diagrams were employed to evaluate the contribution of the grain and grain boundary in the electrical response of the samples and fitted employing an equivalent circuit with two associations of R-CPE (constant phase element). Temperature coefficient of capacitance (TCC) was also obtained and it was possible to observe that there was an increase in the TCC value for the compounds in all frequencies. In addition, IS demonstrated that the activation energy decreasing with TiO2 addition indicating a decrease in the resistive character of the materials.
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Acknowledgements
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), FUNCAP—Fundação Cearense de Apoio ao Desenvolvimento Cientifico e Tecnológico, FINEP—Financiadora de Estudos e Projetos (grants INFRAPESQ-11 and INFRAPESQ-12) and the U. S. Air Force Office of Scientific Research (AFOSR) (FA9550-16-1-0127).
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All the authors participated in the work, however some dedicated more time to some specific activities, which we describe below: conceptualization—RFA, JPCdN. Methodology—Software—DdMC, CS, FFdC. Validation—MASS, FFdC. Formal analysis—FACN, TOA. Investigation—SJTV, RFA. Resources—ASBS. Data curation—DZ, AG. Writing—original draft preparation—RFA, FEAN. Writing—review and editing—MASS, SOS, JPCdN. Visualization—FEN, DBdF. Supervision—SVT, MASS. Project administration—RSS, ASBS. Funding acquisition—ASBS.
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Abreu, R.F., Saturno, S.O., Nobrega, F.A.C. et al. Study of electrical properties with temperature variation by complex impedance spectroscopy (CIS) and effects on the Ba2TiSi2O8–TiO2 matrix. Appl. Phys. A 130, 138 (2024). https://doi.org/10.1007/s00339-024-07295-z
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DOI: https://doi.org/10.1007/s00339-024-07295-z