Structural, morphological and microwave dielectric properties of (Bi_(1-x)Eu_x)NbO_4 ceramics prepared by the sol-gel method

摘要

Since the microwave dielectric properties of BiNbO_4 were first reported, various attempts have been undertaken to improve the properties of this ceramics, such as the addition of oxides or the substitution of bismuth by lanthanides. In this work, (Bi_(1-x)Eu_x)NbO_4 (x = 0.00, 0.05, 0.10, 0.20, 0.50) samples were prepared using the sol-gel method and treated at different temperatures. The structure was studied by X-ray diffraction and Raman spectroscopy and the morphology by scanning electron microscopy, the measurement of the complex permittivity was made using the small perturbation theory, at resonant frequency of 2.7 GHz. In order to study the effect of the treatment temperature and x value in the dielectric properties, the two-way ANOVA method was used. It is clear that the most significant parameter is the treatment temperature. The highest Q × f value was obtained for the sample treated at 1,150℃ due to the densification of the obtained ceramics.