Preparation and dielectric properties of BaBi 1.8 Ln 0.2 Nb 2 O 9 (Ln = Ce, Gd) ceramics
Résumé
The main subject of the presented research is to investigate the dielectric properties of BaBi 1.8 Ln 0.2 Nb 2 O 9 (Ln = Ce, Gd) ceramics prepared by conventional solid state reaction route. The materials were examined using XRD and FT-IR methods. Moreover, the AC conductivity, dielectric constant and dielectric loss of the ceramics were determined. X-ray diffraction confirmed that all these compounds crystallize in an orthorhombic structure. Fourier transform infrared spectroscopy study confirmed the presence of two characteristic vibration bands located at around 617 cm -1 and 818 cm -1 for BaBi 2 Nb 2 O 9 . The experimental results show that the substitution of Bi by Ce or Gd causes a decrease in Curie temperature, dielectric constant and dielectric loss.
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