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VOLUME 62 (1995) | ISSUE 4 | PAGE 334
Experimental confirmation of the instability of the crystal structure of In ice prior to amorphization under pressure
The pressure dependences of the propagation velocities of transverse ultrasonic waves were determined for polycrystalline ice Ih and high-density amorphous ice (hda) in the pressure range 0-1.7 GPa at 78 K. It was determined that the velocity of ultrasound decreases significantly (—10%) in Ih ice polycrystal before amorphization (Γ=78 К, ρ =1.1 GPa) and, correspondingly, the shear modulus softens, which is an experimental indication of mechanical instability of the crystal lattice occurring as a result of solid-phase amorphization under pressure. When the amorphous ice (hda) is heated from 78 К at a pressure ρ—0.05 GPa, anomalous behavior of the transverse velocity of ultrasound is observed at temperatures of 100-130 K. This behavior is evidently associated with a phase transition of hda into amorphous low-density ice (Ida). © 1995 American Institute of Physics.