Structure, synthesis and high dielectric property of (NaBi)(NbCr)O6 pyrochlores

Pyrochlores with composition (NaBi)(NbCr)O6 were sintered in the temperature range of 1100–1250 °C. Dielectric properties of the ceramics were investigated in a wide range of temperatures of − 15 to 200 °C and frequencies of 1–800 kHz. The suitable sintering temperatures for (NaBi)(NbCr)O6 ceramics are suggested from 1150 to 1200 °C. The dielectric constant behavior reflects, in our opinion, the formation of the space charge and the orientational polarization. The pyrochlores have convex resistivity-temperature characteristics around the transition point, and exhibit the negative temperature coefficient of resistance characteristics. The activation energies of conductivity of samples were obtained at various sintering temperatures.