Phase transitions in bismuth under rapid compression

• 来源期刊: 中国物理B（英文版）
• 关键词: bismuth high pressure rapid compression over-pressurization
• 年，卷（期）: 2019,（3）
• 页码范围: 296-299
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/3/036201

摘要

The structural phase transitions of bismuth under rapid compression has been investigated in a dynamic diamond anvil cell using time-resolved synchrotron x-ray diffraction.As the pressure increases,the transformations from phase Ⅰ,to phase Ⅱ,to phase Ⅲ,and then to phase V have been observed under different compression rates at 300 K.Compared with static compression results,no new phase transition sequence appears under rapid compression at compression rate from 0.20 GPa/s to 183.8 GPa/s.However,during the process across the transition from phase Ⅲ to phase V,the volume fraction of product phase as a function of pressure can be well fitted by a compression-rate-dependent sigmoidal curve.The resulting parameters indicate that the activation energy related to this phase transition,as well as the onset transition pressure,shows a compression-rate-dependent performance.A strong dependence of over-pressurization on compression rate occurs under rapid compression.A formula for over-pressure has been proposed,which can be used to quantify the over-pressurization.