Pulse power technology can release megawatt-level electrical energy in a very short period of time, and has a wide range of applications in many special fields. As a key component of pulse power supply, high-performance capacitors play an important role in reducing the weight and volume of equipment and meeting the development of miniaturization and high power. Antiferroelectric ceramics have the advantages of high energy storage density, large discharge current and fast discharge speed, and are important candidates for a new generation of high-performance pulse capacitors. A deep understanding of the physical nature and structure-effect relationship of antiferroelectric ceramics is of great significance to the development of high-performance antiferroelectric ceramic capacitors.
The research team led by researcher Dong Xianlin and Wang Genshui of the Shanghai Institute of Ceramics, Chinese Academy of Sciences has carried out a lot of fruitful research work in the early stage of antiferroelectric ceramics composition design, performance control, and engineering applications. Recently, the team worked closely with the microstructure research team led by Xu Franco, a researcher at the Shanghai Institute of Ceramics, and comprehensively used transmission electron microscopy and electrical characterization to analyze traditional (Pb, La)(Zr,Sn,Ti)O3 (PLZST) anti-iron Electrical ceramics has carried out structural characterization and research on the atomic scale, expanded the understanding of the polarization order of antiferroelectric ceramics, and constructed the correlation law between the structure and performance of antiferroelectric ceramics. The relevant research results were published on Nature Communications (DOI: https://doi.org/10.1038/s41467-020-17664-w).
The study found that the PLZST series of perovskite ceramics all present an incommensurate modulation structure. The modulation mode is divided into polarization size and polarization angle, which can freely transform and coexist in the nanometer scale. The incommensurate structure mainly originates from the periodic modulation of atomic displacement and forms the polarization order of ferroelectric properties. This ferroelectric order is produced by a specific combination of ferroelectric ordered layers. The change in chemical composition can drive the width of the ferroelectric ordered layer to gradually transition in the range of 0.6nm-1.5nm, thereby regulating the incommensurability structure The modulation period. The change in the width of the ferroelectric ordered layer affects the interaction of the nearest neighbor electric dipole, making the key electrical performance parameters such as the turning electric field, the dielectric constant, and the remanent polarization have an approximately linear relationship with the modulation period. These findings provide a basis for the theoretical development and performance optimization of antiferroelectric materials.
The above work has been funded by the National Key Research and Development Program, the National Natural Science Foundation of China, the pre-research field fund, and the Shanghai inorganic material testing and characterization technology platform.
Atomic Scale Characterization of the Polarization Order of PLZST Series Ceramics
Coupling law of order parameter and polarization order parameter of PLZST series ceramics
Structure-activity relationship of PLZST series ceramics
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