AsS melt under pressure: one substance, three liquids.
An in situ high-temperature--high-pressure study of liquid chalcogenide AsS by x-ray diffraction, resistivity measurements, and quenching from melt is presented. The obtained data provide direct evidence for the existence in the melt under compression of two transformations: one is from a moderate-viscosity molecular liquid to a high-viscosity nonmetallic polymerized liquid at P approximately 1.6-2.2 GPa; the other is from the latter to a low-viscosity metallic liquid at P approximately 4.6-4.8 GPa. Upon rapid cooling, molecular and metallic liquids crystallize to normal and high-pressure phases, respectively, while a polymerized liquid is easily quenched to a new AsS glass. General aspects of multiple phase transitions in liquid AsS, including relations to the phase diagram of the respective crystalline, are discussed.
Brazhkin
V V
VV
Institute for High Pressure Physics, Russian Academy of Sciences, 142190, Troitsk Moscow region, Russia.
Katayama
Y
Y
Kondrin
M V
MV
Hattori
T
T
Lyapin
A G
AG
Saitoh
H
H