Abstract
Ternary ceramics with the type of (1 − x)(0.64PNN–0.36PT)– x(0.91PZN–0.09PT) ( x = 0–0.82) were synthesized by the columbite precursor method. X-ray diffraction results demonstrate that all the samples lie within the morphotropic phase boundary (MPB) region in the pure perovskite structure except for the composition with x = 0.82. The dielectric and ferroelectric properties of compositions with x = 0–0.75 were investigated in detail. All the tested compositions show dielectric behaviors of frequency dispersion and diffuse phase transition. The Ni-rich compositions exhibit superior dielectric and ferroelectric properties to those of Ni-poor ones. The composition with x = 0.15 has the maximum peak dielectric constant (23,410) at 1 kHz and the maximum remnant polarization (14.8 μC/cm 2) with the driving electric field at 10 kV/cm. The variation of peak dielectric constant with x can be explained in terms of the product rate of the polar microregion in the materials.
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