Superior energy storage properties in lead-free NaNbO3-based relaxor antiferroelectric ceramics via a combined optimization strategy

A stable relaxor AFE R phase in NaNbO 3 -based ceramics is achieved. An excellent W rec of ∼11.09 J cm −3 and an η of ∼85.7% were realized at 1200 kV cm −1 for x = 0.30 thick film ceramic.