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Phase transition and EOS of zinc sulfide under shock and static compressions up to 135GPa

1999; Elsevier BV; Volume: 60; Issue: 6 Linguagem: Inglês

10.1016/s0022-3697(98)00328-x

1879-2553

Miki Uchino, Tsutomu Mashimo, M. Kodama, T. Kobayashi, Eiichi Takasawa, Toshimori Sekine, Yuichi Noguchi, Hideaki Hikosaka, K. Fukuoka, Yasuhiko Syono, Tadashi Kondo, T. Yagi,

Nonlinear Optical Materials Research

Shock and static compression experiments were performed on zinc sulfide (ZnS) polycrystal in the pressure range up to 135 GPa to investigate the phase transition and equation of state (EOS). Hugoniot data were measured by means of the inclined-mirror method combined with a powder gun and two-stage light gas guns, and the static X-ray diffraction experiment was conducted using a diamond-anvil cell. This material behaved as an elasto-isotropic solid which lost its shear strength above the Hugoniot-elastic limit (less than 4.4 GPa). The phase transition from zinc blende-type (B3) to rock salt-type (B1) took place at approximately 15.7 GPa under shock compression, and finished up to about 37 GPa. The corrected phase transition pressure at 298 K was 15.5 GPa. It was confirmed by the static X-ray diffraction experiment that the B1-type phase was stable at the pressure range up to 80 GPa. The unstable inclined-mirror images over 75 GPa, double inclined-mirror images over 99 GPa, and a discontinuous decrease in free-surface velocity between 87 and 99 GPa were observed. The melting and decomposition were discussed in relation to these peculiar free-surface motion behaviors. The density, Grüneisen parameter, bulk moduli (K0) and the pressure derivative (K0′) of the B1-type phase were estimated to be 4.91±0.03 g/cm3, 0.96±0.03, 105±6 GPa and K0′=3.8±0.1 (K0″=− 0.05 GPa−1), respectively.