Ultrahigh energy storage density, high efficiency and superior thermal stability in Bi0.5Na0.5TiO3-based relaxor ferroelectric ceramicsviaconstructing multiphase structures

BNT-based ceramics with polymorphic PNRs display an ultrahigh W rec of 7.4 J cm −3 and a high η of 89% at 400 kV cm −1 , as well as excellent thermal reliability.