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Crystalline Bi5NbO10 nanoparticles have been achieved through a modifiedsol-gel process using a mixture of ethylenediamine and ethanolamine as asolvent. The Bi5NbO10 nanoparticles were characterized by X-ray diffraction(XRD), differential scanning calorimetry/thermogravimetry, fourier transforminfrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and Ramanspectroscopy. The results showed that well-dispersed 5-60 nm Bi5NbO10nanoparticles were prepared through heat-treating the precursor at 650C and thehigh density pellets were obtained at temperatures lower than those commonlyemployed. The frequency and temperature dependence of the dielectric constantand the electrical conductivity of the Bi5NbO10 solid solutions wereinvestigated in the 0.1 Hz - 1 MHz frequency range. Two distinct relaxationmechanisms were observed in the plots of dielectric loss and the imaginary partof impedance versus frequency in the temperature range of 200-350oC. Thedielectric constant and the loss in the low frequency regime were electrodedependent. The ionic conductivity of Bi5NbO10 solid solutions at 700oC is2.86(ohm m)-1 which is in same order of magnitude for Y2O3-stabilized ZrO2ceramics at same temperature. These results suggest that Bi5NbO10 is apromising material for an oxygen-ion conductor.

Dielectric Relaxation and Electrical Conductivity in Bi5NbO10 Oxygen Ion Conductors Prepared by a Modified Sol-Gel Process