Abstract
(1 − x)Sr(Fe 1/2Nb 1/2)O 3– xPbTiO 3 (SFN–PT) ferroelectric ceramics were prepared by conventional solid-state reaction method via the wolframite precursor route. X-ray diffraction (XRD) measurement confirmed that the synthesized SFN–PT ceramics are of pure perovskite structure. With the increase of the concentration of PbTiO 3 (PT), crystal structure of the sintered SFN–PT ceramics changes from rhombohedral phase to tetragonal phase. Dielectric response of the SFN–PT ceramics changes from diffused and broad dielectric peaks to relatively sharp ones accompanied by the increase of the temperature of dielectric maximum ( T m). Small content of MnO 2 or Li 2CO 3 doping can greatly decrease the dielectric loss of the SFN–PT ceramics, furthermore, the abnormal increase of dielectric constant and loss tangent in the paraelectric phase is suppressed accordingly. Typical P-E hysteresis loops are observed in the SFN–PT ceramics, however, the saturate polarization ( P s) is small. MnO 2 or Li 2CO 3 doping can greatly decrease the coercive field ( E c) of the SFN–PT ceramics accompanied by large increase of P s. Piezoelectric constant d 33 of the SFN–PT ceramics is small except for SFN30–PT70 ceramics, which reaches 22pC/N.
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