Electrical properties and phase transition of Ba(Zr0.05Ti0.95)1 − x(Fe0.5Ta0.5)xO3 ceramics

• Properties of of Ba(Zr0.05Ti0.95)1 − x(Fe0.5Ta0.5)xO3 ceramics were investigated.
• Small amount of dopant produced a large change in dielectric and phase transition.
• A phase diagram of Ba(Zr0.05Ti0.95)1 − x(Fe0.5Ta0.5)xO3 ceramics was proposed.
• Dielectric tunability increased with increasing x concentration.

In this work, properties of Ba(Zr0.05Ti0.95)1 − x(Fe0.5Ta0.5)xO3 ceramics with 0.00≤ x ≤0.07 were investigated. The ceramics were fabricated by a solid state reaction technique. X-ray diffraction analysis indicated that all samples exhibited single phase perovskite. Examination of the dielectric spectra revealed that the Fe and Ta additives promoted a diffuse phase transition, and the two phase transition temperatures, as observed in the dielectric curve of pure Ba(Zr0.05Ti0.95)O3, merged into a single phase transition temperature for higher x concentrations. The transformation was confirmed by ferroelectric measurements. In addition, the doped ceramics exhibited high relative dielectric tunability, especially for higher x concentration samples.

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