Abstract
Abstract 0.05Ba(Mg 1/3 Nb 2/3 )O 3 –(0.95− x )Pb(Mg 1/3 Nb 2/3 )O 3 – x PbTiO 3 [0.05BMN–(0.95− x )PMN– x PT] relaxor ferroelectrics have been synthesized by solid-state reaction. Phase structure and microstructure were characterized by means of X-ray diffraction and scanning electron microscopy (SEM). Dielectricity, piezoelectricity and ferroelectricity were also investigated. A partial phase diagram for this system was established based on the X-ray diffraction and dielectric measurements. A morphotropic phase boundary (MPB) area was identified within the composition range of x =0.33–0.36. A maximum d 33 =585 pC/N could be obtained in 0.05BMN–0.60PMN–0.35PT. With increasing PT content, the behavior of as-prepared ceramics gradually shifts from relaxor to normal ferroelectrics. This pseudo-ternary system also possesses an enhanced ferroelectricity compared to BMN–PT and BZN–PT.
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