The micro-structural, compositional, temperature dependent dielectric and electrical properties of the Bi 1.5 Zn 0.92 Nb 1.5−x Ta x O 6.92 solid solution has been investigated. The increasing Ta content from 0.2 to 1.5 caused; single phase formation, a pronounced grain size reduction from ∼7.0 to 2.5μm, sharp decrease in the dielectric constant from 198 to 88 and an increase in the electrical conductivity from 3.16×10 −10 to 5.0×10 −9 (Ωcm) −1 , respectively. The temperature dependent dielectric constant which is found to be frequency invariant in the frequency range of (0.0–2.0MHz) exhibited a sharp change in the temperature coefficient of dielectric constant at a (doping independent) critical temperature of 395K. The analysis of the measured data reflects a promising future for this type of pyrochlore to be used in high voltage passive device applications.