Abstract
Ferroelectric Ba0.7Sr0.3TiO3(BST) and partially Pb2+ substituted for Ba2+ ceramics (Ba0.7−x Pb x )Sr0.3TiO3 (x=0.1–0.4, BPST) were prepared by using conventional solid-reaction method. XRD analysis shows that the samples microstructure changes from cubic phase to tetragonal one with the Pb2+ content increasing. ESEM analysis shows that the Pb2+ substituted samples have a denser and more uniform surface morphology than that of pure BST. Measured electrical properties suggest that the Pb2+ substitution for Ba2+ in the BST system enhances the ferroelectric performance obviously when x=0.2. In addition, the substitution increases the samples Curie temperature (T c ). (Ba0.5Pb0.2)Sr0.3TiO3 ceramic has good ferroelectric properties measured at a maximal electric field of 30 kV/cm under the condition of room temperature. The corresponding saturated polarization (P s), remnant polarization (P r) and coercive field (E c) is respectively 15.687 μC/cm2, 8.100 μC/cm2 and 6.611 kV/cm. The measured T c of (Ba0.5Pb0.2)Sr0.3TiO3 is 117 °C.
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