衝撃圧縮を用いた固体の高圧相転移の研究

抄録

Through the determination of Hugoniot parameters, we can get useful information about high-pressure phase transition, equations of state (EOS), etc. of solids, without pressure calibration. We have performed the Hugoniot-measurement experiments on various kinds of hard materials of chalcogenides, oxides, nitrides and borides by using a high time-resolution streak camera system (inclined-mirror method) to investigate the yielding property, phase transition and EOS. It was found that almost all brittle materials behave as an elasto-isotropic solid unlike metals (elasto-plastic solid), except TiB₂. The high-pressure phase transitions were observed for ZnS, ZnSe, TiO₂, ZrO₂, Gd₃Ga₅O₁₂, AlN and B₄C. Some oxide materials showed virtually incompressible property in the high-pressure phase region. Here, the Hugoniot-compression data are reviewed, and the yield property and phase transition of these hard materials are discussed, as well as the EOS of the high-pressure phase.