Affiliation:
1. China National Light Industry Key Laboratory of Functional Ceramic Materials Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province Advanced Ceramic Materials Research Institute School of Materials Science and Engineering Jingdezhen Ceramic University Jingdezhen China
Abstract
AbstractA‐site vacancy‐engineered Ba0.015+1.5xSr0.245‐1.5x□0.03Bi0.385Na0.325TiO3 (B0.015+1.5xS0.245‐1.5x□0.03BNT, x = 0, 0.012, 0.024, 0.036, 0.048, 0.06) ceramics were fabricated by a solid‐state reaction method. The effect of Ba/Sr regulation on the structure, polarization, and dielectric energy storage properties of the B0.015+1.5xS0.245‐1.5x□0.03BNT ceramics were investigated. With the increase of the x value, the lamellar microdomains transform into the coexistence of banded domains and nanodomains. A double‐like P‐E hysteresis loop with a high polarization value (Pmax > 35 μC/cm2) can be obtained at a very low electric field of 60 kV/cm. Consequently, a large recoverable energy storage density (Wrec = 2.33 J/cm3) can be achieved at a relatively low applied electric field of 130 kV/cm. The designed B0.087S0.173□0.03BNT also exhibits high dielectric constant (εr = 3510 @150°C&1 kHz) with suitable temperature capacitance coefficient (TCC150°C = ±15%) over the temperature range of 17°C∼382°C. These findings provide a novel vacancy‐engineered avenue towards the design of BSBNT relaxor ceramics with high Wrec and good stability for low‐voltage driven high‐temperature pulsed power capacitor.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Jiangxi Province
Subject
Materials Chemistry,Ceramics and Composites