Abstract
Ba1-y-xPr2y/3⃞y/3(Na0.5Bi0.5)xTi0.9Zr0.1O3 (y = 0.005; x = 0.05, 0.1 and 0.15) (BZT-Pr-xNBT) ceramics were prepared using a solid state reaction method. X-ray diffraction (XRD) analysis at room temperature (RT) showed a tetragonal perovskite structure for all compositions. By adding Na0.5Bi0.5TiO3 (NBT) on BZT-Pr ceramic, a core-shell grain structure is developed, responsible for an improved dielectric temperature stability with broadened curves at the lower dielectric peak (Tl) and the Curie temperature (TC). The temperature coefficient of capacitance curve of the composition BZT-Pr-0.15NBT satisfied the EIA X7R specification and the TC value is successfully increased. These compositions are of relaxor type at Tl, which was found near RT. All Raman bands show a broadening with the increasing of NBT content. The remanent polarization (Pr), the coercive field (EC) and the piezoelectric coefficient (d33) decrease when the NBT content increases. The photoluminescence (PL) results exhibit a strong red emission (at 617 nm and 649 nm) for all ceramics.
Published Version
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