BaTiO₃-(Na_0.5Bi_0.5)TiO₃ Ceramic Materials Prepared via Multiple Design Strategies with Improved Energy Storage

Area of Science:

• Materials Science
• Ceramic Dielectrics
• Energy Storage

Background:

• Next-generation high-power capacitors require environmentally friendly, lead-free ceramic dielectrics with superior energy storage.
• Existing barium titanate (BaTiO3)-based ferroelectric ceramics face limitations in energy density and efficiency.

Purpose of the Study:

• To develop novel lead-free ceramic dielectric materials for enhanced energy storage applications.
• To investigate the effect of incorporating Ca0.7La0.2(Mg1/3Nb2/3)O3 into a [0.65BaTiO3-0.35(Na0.5Bi0.5)TiO3] solid solution.

Main Methods:

• Solid solution formation between Ca0.7La0.2(Mg1/3Nb2/3)O3 and [0.65BaTiO3-0.35(Na0.5Bi0.5)TiO3].
• Characterization of crystal structure, insulation performance, breakdown strength, and hysteresis loss.
• Evaluation of energy storage density and efficiency (η) under varying conditions.

Main Results:

• The addition of Ca0.7La0.2(Mg1/3Nb2/3)O3 modified the crystal structure and improved insulation and breakdown strength.
• Optimal 10 mol% Ca0.7La0.2(Mg1/3Nb2/3)O3 incorporation yielded a retrievable energy density of ~3.40 J cm-3 and efficiency of ~81% at 340 kV cm-1.
• The ceramic exhibited good temperature (30-90 °C) and frequency (0.5-300 Hz) stability.

Conclusions:

• The developed lead-free ceramic dielectric shows significant potential for pulsed power device applications.
• The enhanced energy storage density and efficiency surpass traditional BaTiO3-based ferroelectric ceramics.
• This material offers a promising alternative for high-performance, environmentally conscious capacitor development.