Giant electrocaloric effect in the thin film relaxor ferroelectric 0.9   PbMg_(1/3)Nb_(2/3)O_3 - 0.1 PbTiO_3 near room temperature
  We have recently observed a giant electrocaloric effect (12 K in 25 V) in 350 nm sol-gel Pb Zr_0.95 Ti_0.05 O_3 films near the ferroelectric Curie temperature of 242oC. Here we demonstrate a giant electrocaloric effect (5 K in 25 V) in 260 nm sol-gel films of the relaxor ferroelectric 0.9 PbMg_(1/3)Nb_(2/3)O_3 - 0.1 PbTiO_3 near the Curie temperature of 60oC. This reduction in operating temperature widens the potential for applications in novel cooling systems. 
A.S. Mischenko, Q. Zhang, R.W. Whatmore, and N.D. Mathur