The investigation of lead-free ceramics with exceptional piezoelectric properties holds great importance in the substitution of lead-based materials, hence promoting the development of green technology and fostering an environmentally sustainable society. This study successfully synthesized two series of Bi(Mg 2/3 Nb 1/3 )O 3 (BMN)-modified BiFeO 3 –BaTiO 3 (BF–BT) lead-free piezoelectric ceramics using the conventional solid-state reaction approach. The phase structure, microstructure, dielectric, and piezoelectric properties of these ceramics were comprehensively investigated. A typical perovskite structure is observed in all probed compositions, and the associated phase structure undergoes a gradual transition from a rhombohedral-cubic phase mixture to a cubic-dominant phase structure as increases the content of BMN and BT. All compositions exhibit obvious core–shell microstructures with inhomogeneous element distributions. Most importantly, the BF–0.30BT–0.005BMN and BF–0.34BT–0.03BMN piezoelectric ceramics presented remarkable values for the piezoelectric coefficient (225 pC/N) and converse piezoelectric coefficient (396 pm/V), respectively. These findings highlight the potential of BMN-modified BF–BT ceramics for use in high-performance piezoelectric applications.
Dielectric capacitors are used in pulsed power devices due to their high-power density. The energy storage density and efficiency need to be further improved to widen their applications. This work investigates the energy storage of high entropy ceramic (Pb 0.25 Ba 0.25 Ca 0.25 Sr 0.25 )TiO 3 synthesized by the solid-state method. The Bi(Mg 2/3 Nb 1/3 )O 3 (BMN) is introduced to enhance its energy storage performance. The introduction of BMN from x = 0 to 0.15 reduces the grain size from 5.9 μm to 245 nm, increases the band gap from 2.98 to 3.05 eV, and improves the differences between saturation and remnant polarization from 11.85 to 14.60 μC/cm 2 . The phase diagram of this system was constructed by dielectric properties analysis to understand the effect of Bi(Mg 2/3 Nb 1/3 )O 3 in the energy storage performance. The optimal energy density of 5.58 J/cm 3 and efficiency of 89.4% was achieved in 0.9PBCST-0.1BMN which can be promising candidates for application in dielectric energy storage.
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