High energy-storage density and giant negative electrocaloric effect in PLZS antiferroelectric thick film ceramics prepared via the tape-casting process

Antiferroelectric materials are highly desired for high energy-storage density capacitors and electrocaloric refrigerator in the future due to their excellent energy storage properties and giant negative electrocaloric effect, which have attracted great attention in recent years. In the present work, a highly recoverable energy density (W-rec) and a large reversible adiabatic temperature change (Delta T) were obtained simultaneously in PLZS thick film ceramics (TFCs). A maximum W-rec of 9.84 J<middle dot>cm(-3) with an efficiency of 85.2 % at 440 kV<middle dot>cm(-1), and a negative Delta T of -9.50 degrees C at 280 kV<middle dot>cm(-1) were obtained. Moreover, the maximum value of electrocaloric strength of 0.98 K<middle dot>m<middle dot>MV-1 was achieved for Pb0.97La0.02(Zr0.50Sn0.50)O-3 TFCs. These results demonstrate that the PLZS TFCs can be applied potentially for high energy-storage density capacitors and refrigerators.