Iron Concentration Effect on the Microwave Dielectric Properties of BiNbO4 Ceramics

  • S. Devesa
  • M. P. Graça
  • L. C. Costa
Conference paper
Part of the NATO Science for Peace and Security Series B: Physics and Biophysics book series (NAPSB)


Ceramic dielectrics based on bismuth are recognized as materials with low sintering temperature and have been studied for different applications in the microelectronic area. Since 1992, when Kagata reported the microwave dielectric properties of bismuth niobate (BiNbO4), various attempts have been undertaken to improve the microwave dielectric properties of this ceramic material. Besides the addition of different oxides, such as CuO, ZnO, V2O5, PbO, Bi2O3 and Fe2O3, several researchers tried to improve bismuth niobate properties by adding lanthanides. In this work, (Bi1-xFex)NbO4 (0.00≤ × ≤1.00) samples were prepared using the sol-gel method. The fine particles were pressed into cylinders and heat-treated at specific temperatures. Single phase samples of BiNbO4 (x = 0.00) and FeNbO4 (x = 1.00) were then used as precursors for (Bi1-xFex)NbO4, prepared by the solid state reaction method. The microwave dielectric characterization of the samples was performed using the small perturbation method, and related to their structure. With the sol-gel method the substitution of bismuth by iron was successful, since two non-stoichiometric phases, Bi1.34Fe0.66Nb1.34O6.35 and Bi1.721Fe1.056Nb1.134O7, were obtained. Moreover, the inclusion of iron inhibited the formation of low and high temperature triclinic bismuth niobate. With the solid state technique, the substitution of bismuth by iron was not achieved; it was observed that the dielectric constant decreases with the increase of the FeNbO4 phase and that the dielectric losses follow the opposite trend.


Bismuth niobate Sol-gel Solid state Microwaves Dielectric properties 


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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • S. Devesa
    • 1
  • M. P. Graça
    • 1
  • L. C. Costa
    • 1
  1. 1.I3N and Physics DepartmentUniversity of AveiroAveiroPortugal

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