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- Title
Study of electrical properties with temperature variation by complex impedance spectroscopy (CIS) and effects on the Ba<sub>2</sub>TiSi<sub>2</sub>O<sub>8</sub>–TiO<sub>2</sub> matrix.
- Authors
Abreu, R. F.; Saturno, S. O.; Nobrega, F. A. C.; da M. Colares, D.; do Nascimento, J. P. C.; Vasconcelos, S. J. T.; Nogueira, F. E. A.; de Freitas, D. B.; do Carmo, F. F.; Ghosh, A.; Abreu, T. O.; Silva, M. A. S.; Silva, R. S.; Trukhanov, S. V.; Zhou, Di; Singh, C.; Sombra, A. S. B.
- 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.
- Subjects
IMPEDANCE spectroscopy; MATRIX effect; DIELECTRIC properties; PERMITTIVITY; NYQUIST diagram
- Publication
Applied Physics A: Materials Science & Processing, 2024, Vol 130, Issue 2, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-024-07295-z