Microstructural, Raman and dielectric properties of (1−x)NaNbO3–xBiCrO3 biphase ceramics

The phase, microstructural and dielectric properties of (1−x)NaNbO3–xBiCrO3 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) ceramics with perovskite–pyrochlore mixed-phase were investigated. A single-phase solid solution in the sintered specimens was identified as observed perovskite phase for x = 0.1 and pyrochlore for x = 0.5. The results indicate that the microstructure has mixed large and small grains. Dielectric constants and dielectric loss were measured as functions of temperatures (−15 to 200 °C) at 1 kHz. Complex impedance spectroscopy shows the presence of barrier layers in biphase ceramics. The Raman spectra and porosity percentage in the biphase system were also measured.