Abstract
Na 1/2Bi 1/2TiO 3 (NBT) doped with BaTiO 3 (BT) has recently shown promising piezoelectric properties in single crystal form. The piezoelectric properties appear to be highly dependent on BT concentration, with compositions close to the morphotropic phase boundary (∼6% BT) having the highest piezoelectric coefficients. Previous studies have resulted in conflicting conclusions regarding the presence and nature of the superlattice in NBT. Using HREM and hot-stage TEM electron diffraction, we show that flux-grown single crystals of compositions (1− x)NBT– xBT with x<0.08 exhibit superlattice reflections that are present from room temperature up to 500°C, above which temperature they reversibly vanish. The reflections are consistent with a superstructure due to single-axis in-phase octahedral tilt ( a 0 a 0 c +). The dependence of the superlattice reflection intensity on temperature and BT content as well as possible mechanisms of superlattice formation are discussed.
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