Phase Formation and Electrical Characterization of Lead-Free (1-x) Ba(Zr0.05Ti0.95) O3-xBa(Fe0.5Ta0.5)O3 Binary Solid Solution

The properties of the solid solution (1-x) BZT05-xBFT were investigated. All samples showed a pure perovskite phase indicating a high solubility limit of BFT in BZT. For x = 0 >= 1, the samples exhibited strong dielectric-frequency dispersion. Increasing BFT enhanced the dielectric constant and the degree of dielectric-frequency dispersion. Very high dielectric constants (>35,000 at 1 kHz) were observed for the x = 0 >= 5 samples at temperatures > 150 degrees C. An obvious change in dielectric behavior was found for the modified sample (x = 0.1). By using the complex impedance spectroscopy, the dielectric behaviour could be explaned in terms of Maxwell-Wagner polarization due to the heterogeneous conduction of the modified samples. The ferroelectric properties of the x > 0 >= 1 samples also presented a large change as compared to the unmodified sample due to these samples had higher leakage current.