Abstract
The dielectric behaviour of Ba(Ti1−yCey)O3 solid solutions (y = 0–0.3)has been studied. A small amount of Ce doping (y = 0.02)has weak influence on the dielectric behaviour of Ba(Ti1−yCey)O3. With increasingCe concentration, three phase transitions of pure BaTiO3 are pinched into onerounded dielectric peak with frequency dispersion, and the relaxationtime follows the Vogel–Fulcher relation. The evolution from a normalferroelectric to a ferroelectric relaxor is emphasized. High strains (S = ∼ 0.1–0.19%)with a small hysteresis under ac fields are obtained in ferroelectric relaxorsBa(Ti1−yCey)O3. The physical mechanism of the relaxation process, the pinchingeffect of the phase transitions and their influence on the ferroelectric andelectrostrictive behaviour are discussed.
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