The research carried out has been focused on the dielectric characterization of niobate based ceramic materials, prepared by the sol-gel method, in the radiofrequency and microwave frequency range, using the impedance spectroscopy technique and the resonant cavity method, respectively. Since it is recognized that the behaviour of functional materials is intrinsically linked to their structures, porosity, grain size and grain boundaries, structural and the morphological characterizations are key factors to understand the dielectric properties of these materials. Thus, techniques such as X-ray diffraction, Raman spectroscopy and scanning electron microscopy are applied in the characterization of the synthesized ceramics.
Publications [LaTeX]
Papers
International Journals
1 - Influence of the Preparation Method on the Structural, Morphological and Dielectric Properties of FeNbO4 Ceramics
S Devesa, F Goncalves, M Graca
Materials 16(8), 3202 (2023)
2 - Impedance Spectroscopy Study of Bi1.34Fe0.66Nb1.34O6.35 Ceramics
S Devesa, MP Graca, LC Costa
J. Electron. Mater. 50(7), 4135-4144 (2021)
3 - Tuning Green to Red Color in Erbium Niobate Micro- and Nanoparticles
S Devesa, J Rodrigues, SS Teixeira, AP Rooney, MPF Graca, D Cooper, T Monteiro, LC Costa
Nanomaterials 11(3), 660 (2021)
4 - Electrical and magnetic characterization of Bi1-xFexNbO4 ceramics
S. Devesaa, P. S. P. da Silva, M. P. Graça, M. Valente, L. C. Costa, J. A. Paixão
Ionics 27, 5347-5357 (2021)
5 - Microwave dielectric properties of the binary system BiNbO4–FeNbO4
S. Devesa, M. P. Graça, L. C Costa
ECS J. Solid State Sci. Technol. 9(9), 093010 (2020)
6 - Structural, morphological and dielectric properties of ErNbO4 prepared by the sol-gel method
S. Devesa, S. S. Teixeira, A. P. Rooney, M. P. Graça, D. Cooper, L. C.
J. Phys. Chem. Solids, 109619 (2020)
7 - Impedance spectroscopy studies of ErNbO4 synthesised by the sol–gel method
S. Devesa, P. S. P. da Silva, M. P. Graça, L. C. Costa, J. A. Paixão
J Sol-Gel Sci Technol 96, 143-152 (2020)
Communications
Poster
8 - Analogias no Ensino da Eletricidade no 9º ano
T. Esperança, S. Devesa, M.J. de Almeida, P.M. Gordo
Física 2018 – 21ª Conferência Nacional de Física e 28º Encontro Ibérico para o Ensino da Física 29 a 31 de agosto e 1 de setembro, Covilhã, Portugal (2018)
