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Impedance Spectroscopy Study of Mg4Nb2O9 - TiO2 Composites for Ceramic Capacitors Applications

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Abstract:

The dielectric properties of Mg4Nb2O9 – TiO2 composites in the low-frequency range were evaluated under temperature variation. X-ray diffraction demonstrated that Mg4Nb2O9 (MNO) reacted with the added TiO2, resulting in the formation of Mg5(Nb0.625Ti0.375)4O15 as a new phase. Using Complex Impedance Spectroscopy (CIS), it was possible to observe that the activation energy (Ea) varied between 1.16 and 1.64 eV with the addition of TiO2. Thermal stability was evaluated through the Temperature Coefficient of Capacitance (TCC), and it was observed that the systems could function as Class 1 ceramic capacitors according to EIA RS-198 at various frequencies. The TCC values suggested that the Mg4Nb2O9 – TiO2 system would be a promising candidate for applications in the low-frequency range as a ceramic capacitor.

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Periodical:

Advanced Materials Research (Volume 1190)

Pages:

57-68

DOI:

https://doi.org/10.4028/p-9Cl3vf

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Online since:

July 2026

Authors:

Juscelino Chaves Sales, Francisco Alekson Chaves Nobrega, João Paulo Costa do Nascimento*, Antonio Jefferson Mangueira Sales, Paulo Maria de Oliveira Silva, Felipe Felix do Carmo, Roterdan Fernandes Abreu, Marcelo Antonio Santos da Silva, Antonio Sérgio Bezerra Sombra

Keywords:

Ceramic Capacitors, Ceramic Composites, Complex Impedance Spectroscopy (CIS), Dielectric Properties, Temperature Stability

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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