Abstract
The structural, dielectric, ferroelectric, and ferromagnetic properties of multiferroic ceramics (1–x)Ba(Zr0.2Ti0.8)O3-xBa0.7Ca0.3FeTaO5 (abbreviated as (1–x)BZT-xBCFT where x = 0.2, 0.25, and 0.4) were investigated systematically. Ceramics possess a tetragonal phase of a perovskite structure. Dielectric-temperature spectrums exhibit a dielectric relaxation phenomenon that behaves as a dielectric step and frequency dispersion. X-ray photoemission spectroscopy confirmed the coexistence of Fe2+ and Fe3+. It is concluded that the dielectric relaxation in (1–x)BZT-xBCFT originates from the electron hopping in the dipole formed by Fe2+ and Fe3+. Multiferroic behavior that coexisted with ferroelectricity and ferromagnetism was well established by magnetic and ferroelectric measurements.
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