Impedance spectroscopy analysis of an FeNbO4 matrix with different additions of TiO2 and the effects of temperature variation

Junior, M. H. Bezerra; Abreu, T. O.; Carmo, F. F. do; Morais, J. E. V. de; Oliveira, R. G. M.; Silva, M. A. S.; Andrade, Humberto Dionísio de; Queiroz, I.S.; Mota, J.C.M.; Sombra, A. S. B.

doi:10.1007/s10854-021-05314-w

Cited by 3 publications

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“…In 2021, Bezerra et al carried out the synthesis of FeNbO 4 via the solid-state reaction method with Fe 2 O 3 and Nb 2 O 3 as precursors. The obtained powders were thermally treated at 1200 • C for 4 h, obtaining monoclinic FeNbO 4 [21].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Preparation Method on the Structural, Morphological and Dielectric Properties of FeNbO4 Ceramics

2023

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In this work, iron niobate (FeNbO4) was prepared via two processes based on the sol-gel method: colloidal gel and polymeric gel. The obtained powders were submitted to heat treatments at different temperatures based on the results obtained via differential thermal analysis. The structures of the prepared samples were characterized via X-ray diffraction and the morphology was characterized via scanning electron microscopy. The dielectric measurements were performed in the radiofrequency region using the impedance spectroscopy technique and in the microwave range using the resonant cavity method. The influence of the preparation method was noticeable in the structural, morphological and dielectric properties of the studied samples. The polymeric gel method promoted the formation of monoclinic and orthorhombic iron niobate at lower temperatures. The differences in the samples’ morphology were also remarkable, both in the size and shape of the grains. The dielectric characterization revealed that the dielectric constant and the dielectric losses had the same order of magnitude and similar trends. A relaxation mechanism was identified in all the samples.

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Section: Introductionmentioning

confidence: 99%