Enhanced energy storage and photoluminescence properties in ErBiO3-doped (Na0.5Bi0.5)TiO3-SrTiO3 ceramics

(1-x)(0.75Na(0.5)Bi(0.5)TiO(3)-0.25SrTiO(3))-xErBiO(3) (NBST-xEB, x = 0-0.04) ceramics were fabricated through a solid state reaction method. Scanning electron microscopy investigation shows that grain size of the ceramics decreases with increasing x. X-ray diffraction results reveal that all the ceramics are pseudocubic phase. An enhanced disordering of local structure by EB doping is revealed by Raman spectra. The NBST-xEB ceramics exhibit excellent dielectric stability within a wide temperature range after EB doping. A relatively high recoverable energy storage density (W-rec) of 1.834 J/cm(3) with efficiency (eta) of 71% are obtained for NBST-0.02 EB ceramics under a moderate electric field of 148 kV/cm. The W-rec and eta of the NBST-0.02 EB ceramics exhibit excellent fatigue stability (10(4)) and temperature stability (W-rec > 0.834 J/cm(3), eta > 64%) within 30-200 degrees C under 100 kV/cm. With the introduction of EB, the NBST-xEB ceramics also show strong photoluminescence properties due to the presence of Er3+.