High dielectric constant observed in (1 -x)Ba(Zr_(0.07)Ti_(0.93))O_(3-x)Ba(Fe_(0.5)Nb_(0.5))O_3 binary solid-solution

摘要

Binary solid-solutions of the (1 - x)Ba(Zr_(0.07)Ti_(0.93))O_3-xBa(Fe_(0.5)Nb_(0.5)O_3) system, with 0.1 ≤ x ≤ 0.9,were fabricated via a solid-state processing technique. X-ray diffraction analysis revealed that all samples exhibited a single perovskite phase. The BaFeo.5Nbo.5O3 also promoted densification and grain growth of the system. Dielectric measurements showed that all samples displayed a relaxor like behavior. The x = 0.1 sample presented a dielectric-frequency and temperature with low loss tangent (<0.07 at 10 kHz). For x > 0.2 samples, the dielectric data showed a broad dielectric constant-temperature curve with a giant dielectric characteristic. In addition, a high dielectric constant > 50,000 (at 10 kHz and temperature > 150 ℃) was observed for the x = 0.9 sample.