Structural transformations including melting and recrystallization during shock compression and release of germanium up to 45 GPa

Article

关键词: PHASE-TRANSITION STRESSES;    AXIAL YIELD STRENGTHS;    X-RAY-DIFFRACTION;    HIGH-PRESSURES;    GROUP-IV;    III-V;    IRON;    AMORPHIZATION;    POLYMORPHISM;    TEMPERATURE;   

DOI  :  10.1103/PhysRevB.99.134101

来源: SCIE

【 摘 要 】

Solid-solid and solid-liquid transformations were examined in Ge(100), using in situ x-ray diffraction measurements during uniaxial strain compression and release. For final stresses above 15.7 GPa, the Ge transformed to a highly textured tetragonal beta-Sn phase. At 31.5 GPa and above, Ge transformed to the molten phase. Full stress release (uniaxial strain) from the beta-Sn phase, from the melt boundary, and from the completely molten phase, resulted in reversion to an untextured cubic diamond (cd) phase. These findings demonstrate that the cd to beta-Sn phase change is reversible, and that recrystallization from the liquid phase occurs on nanosecond timescales during release.

【 授权许可】

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