As a class of key basic functional materials, antiferroelectric materials have excellent performances such as high energy storage density, good temperature stability, fast charge and discharge time, and good fatigue resistance. They are widely used in displacement drives, high-power pulse power supplies, and energy Storage capacitors and other devices are hot spots in the world for researching new energy, smart materials and devices. Due to the difficulty of growing anti-ferroelectric single crystals, the current research reports mainly focus on the ceramic system, and less about anti-ferroelectric single crystals.
With the support of the Chinese Academy of Sciences' strategic leading science and technology project, the National Natural Science Foundation of China and the Youth Science Foundation project, and the Fujian Industrial Guidance Project, Long Xifa team, a researcher of the Key Laboratory of Optoelectronic Materials Chemistry and Physics of the Chinese Academy of Sciences, adopted component design. Solved the growth problem of Pb(Lu0.5Nb0.5)O3-based antiferroelectric single crystal, obtained the bulk crystal material with the size up to 20mm×18mm×10mm, and realized the electric field induced secondary ferroelectric-ferroelectric phase through the composition control The variable behavior greatly enhances the saturation polarization intensity of the material, and ultimately obtains a substantial increase in energy storage density. The effective energy storage density of single crystal material reaches 4.81J/cm3, and the energy storage efficiency is as high as 82.36%. The study also deeply explored the correlation between the phase structure, crystallographic orientation and microstructure characteristics of crystals and high electrical storage density and other excellent electrical properties, which provided new ideas for exploring new antiferroelectric materials.
Related achievements were published on ACS Appl. Mater. Inter. with the title of Enhanced Energy Storage Density of Lead Lutetium Niobate Crystals by Electric Field-Induced Secondary Phase Transition via Na/La Co-doping. Assistant researcher Yang Xiaoming was the first author and researcher of the paper He Chao is the corresponding author.
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