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TT7.01 - Nanosecond Dynamics of Structure Phase Transition in Bismuth at High Pressures Studied Using Picosecond X-Ray Diffraction 
December 4, 2014   8:30am - 9:00am

We present nanosecond dynamics of structure phase transition in bismuth at high pressures directly measured using picosecond X-ray diffraction with synchrotron radiation and laser-shock compression. It is very important to understand the phase transition dynamics of bismuth in high-pressure science, because the bismuth has multiple phase under 10 GPa and their transition pressure is one of the pressure standard for static compression. We performed nanosecond time-resolved measurements with a laser pump and X-ray probe technique using a plasma-confinement target. The 8-ns pulsed laser was used for generating shock compression, and the 100-ps pulsed X-rays, generated from Photon Factory Advanced Ring at High Energy Accelerator Research Organization Japan, were used for X-ray diffraction. The Debye-Scherrer ring pattern, obtained by a single X-ray pulse, clearly shows diffraction peaks and enables us to determine the crystal structure. The time-resolved X-ray diffraction shows that the Bi-I structure, which is at ambient pressure and temperature, transfers to the Bi-V structure within 5 ns under the compression process. The maximum shock pressure is estimated to be ~11 GPa, which is higher than the reported transition pressure to Bi-V structure (7.7 GPa) by static compression. In this process no trace of other structures, which are stable at lower pressures, has been observed. On the other hand, under the shock-release process, the successive structure change (V-III-II-I structures) takes place along with pressures within 30 ns.

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