Abstract
10 mol% Pb(Fe 1/2Nb 1/2)O 3 (PFN) modified Pb(Mg 1/3Nb 2/3)O 3–PbZr 0.52Ti 0.48O 3 (PMN–PZT) relaxor ferroelectric ceramics with compositions of (0.9 − x)PMN–0.1PFN– xPZT ( x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9) were prepared. X-ray diffraction investigations indicated that as-prepared ceramics were of pure perovskite phase and the sample with composition of x = 0.8 was close to morphotropic phase boundary (MPB) between rhombohedral and tetragonal phase. Dielectric properties of the as-prepared ceramics were measured, and the Curie temperature ( T c) increased sharply with increasing PZT content and could be higher than 300 °C around morphotropic phase boundary (MPB) area. At 1 kHz, the sample with composition of x = 0.1 had the largest room temperature dielectric constant ɛ r = 3519 and maximum dielectric constant ɛ m = 20,475 at T m, while the sample with composition of x = 0.3 possessed the maximum dielectric relaxor factor of γ = 1.94. The largest d 33 = 318 pC/N could be obtained from as-prepared ceramics at x = 0.9. The maximum remnant polarization ( P r = 28.3 μC/cm 2) was obtained from as-prepared ceramics at x = 0.4.
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