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Abstract

Bi3Ni2Ta3O14 (BNT) pyrochlores and a series of its solid solutions Bi3Ni2-xTa3O14-x (- 0.2 ≤ x ≤ 1.0) were prepared via conventional solid state method. The phase purity of BNT and its solid solutions was investigated by X-ray diffraction (XRD) method. Phase pure of BNT cubic pyrochlore was successfully synthesized at x = 0.6 (Bi3Ni1.4Ta3O13.4) with sintering temperature of 1050oC over 24 hours. The single phase material crystallized in a cubic system, space group Fd3m with a = b = c = 10.5134 Å, α = β = γ = 90º, respectively. Detailed analysis was carried out on single phase material and the electrical properties was determined by ac impedance spectroscopy in the frequency of 5 Hz to 13 MHz. Conducticity revealed that the sample was in bulk properties and it had a high activation energy of 0.93eV and 0.95eV for heat and cool respectively. Ac impedance indicate that BNT exhibits dielectric properties with permittivity, ε’ of 44.85 and dielectric loss, tan δ, of 0.003 at room temperature in the frequency region 1 x 105 Hz (100 kHz), respectively.