Temperature‐stable dielectric and energy storage properties of La(Ti 0.5 Mg 0.5 )O 3 ‐doped (Bi 0.5 Na 0.5 )TiO 3 ‐(Sr 0.7 Bi 0.2 )TiO 3 lead‐free ceramics

A new type of (0.7− x )Bi 0.5 Na 0.5 TiO 3 ‐0.3Sr 0.7 Bi 0.2 TiO 3 ‐ x LaT i 0.5 Mg 0.5 O 3 ( LTM 1000 x , x  = 0.0, 0.005, 0.01, 0.03, 0.05 wt%) lead‐free energy storage ceramic material was prepared by a combining ternary perovskite compounds, and the phase transition, dielectric, and energy storage characteristics were analyzed. It was found that the ceramic materials can achieve a stable dielectric property with a large dielectric constant in a wide temperature range with proper doping. The dielectric constant was stable at 2170 ± 15% in the temperature range of 35‐363°C at LTM 05. In addition, the storage energy density was greatly improved to 1.32 J/cm 3 with a high‐energy storage efficiency of 75% at the composition. More importantly, the energy storage density exhibited good temperature stability in the measurement range, which was maintained within 5% in the temperature range of 30‐110°C. Particularly, LTM 05 show excellent fatigue resistance within 10 6 fatigue cycles. The results show that the ceramic material is a promising material for temperature‐stable energy storage.