Abstract
Shock recovery experiments at pressures of up to 22 GPa on BaSi2 powder are performed using a propellant gun. The shocked samples are characterized using X-ray diffraction analysis, Raman spectroscopy, and scanning electron microscopy (SEM). Only the orthorhombic BaSi2 phase is detected and no evidence of amorphization or phase transition is obtained. The SEM images reveal that the BaSi2 powder is consolidated at pressures below 10 GPa, whereas many cavities in addition to whiskers with diameters of several hundreds of nanometers are formed on the surface of the sample shocked at 10 GPa. These whiskers are due to the eruption of BaSi2 vapor from the cavities and the subsequent mixing of this vapor with air. The shock-induced heat may be the cause of this vaporization.
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