231 / 2023-04-17 14:45:40

Structure and properties of BiFeO3 ferroelectric material under extreme high pressure conditions

high pressure

高压物理与材料科学 > 功能材料-海报

High-power pulse power supplies have important applications in high-tech and national defense technology fields. Ferroelectric ceramics are a key material, and their working principle involves utilizing the polarization energy storage of ferroelectric materials, and then using high-voltage impact to change the material structure, causing it to lose polarity and release charge to form a current. In the past half century, only one ferroelectric material, lead zirconate titanate (PZT), has been applied in this field. Currently, due to insufficient understanding of the high-pressure structure and properties of other ferroelectric materials, there is no material available to replace or supplement the PZT. The ferroelectric ceramic BiFeO₃ (BFO) is a new type of high-energy storage ferroelectric ceramic material, which has been a hot topic in the field of ferroelectric physics for the past twenty years. Due to its lead-free, low density, and high-performance characteristics, the BFO is considered a promising ferroelectric material that could replace the PZT. This study focuses on the ferroelectric ceramic the BFO and mainly investigates the following aspects [1]: first, the phase transition pressure and structural changes of the BFO ceramics under high pressures; second, the dynamic high-pressure shock discharge performance of the BFO ceramics; and third, the phase transition mechanism of the BFO ceramics. The results of this study are expected to provide a new material system for the development of ferroelectric pulse power sources, while also having positive implications for the development of high-pressure ferroelectric physics.