Executive Summary : | Dielectric capacitors are ideal for power conditioning and pulsed discharge applications in electronic systems like accelerators, hybrid electric vehicles, space travel power systems, and kinetic energy weapons due to their fast charge and discharge rates, high power density, good fatigue resistance, and temperature stability. However, antiferroelectric materials, such as AgNbO3 (AN), have unique double-like polarization hysteresis loops and higher saturation polarization, making them more favorable for capacitive energy storage. AgNbO3 (AN) has a large polarization up to 52 C cm² and a large recoverable energy density with high efficiency due to its antiferroelectricity characteristics. However, poor breakdown strength and antiferroelectric stability limit the energy storage performance of AN ceramics. To overcome these drawbacks, heterovalent ions can be doped into the A- and B-sites of AN ceramics. This substitution of ionic radius plays an important role in changing the crystal structure, which influences the antiferroelectricity of the ceramic. This project proposes synthesizing Ag₁₂ANb₁BO₃, which exhibits a large recoverable energy storage density and efficiency. The substitution of a small amount of heterovalent AN into AN leads to the stability of the antiferroelectric AN system, disrupting the long-range ferroelectric order and improving electromechanical characteristics. X-ray diffraction analysis shows that co-doped AN ceramics have a pure perovskite structure. The temperature stability of the recoverable energy storage behavior of ceramics is discussed, and the evolution of polarization vs. electric field (P-E) loop, electric field vs. strain (s-E) loop, and recoverable storage energy density will be observed for co-doped AN ceramics. |