Two Calorimetrically Distinct States of Liquid Water Below 150 Kelvin
Vapor-deposited amorphous solid and hyperquenched glassy water were found to irreversibly transform, on compression at 77 kelvin, to a high-density amorphous solid. On heating at atmospheric pressure, this solid became viscous water (water B), with a reversible glass-liquid transition onset at 129 +/- 2 kelvin. A different form of viscous water (water A) was formed by heating the uncompressed vapor-deposited amorphous solid and hyperquenched liquid water. On thermal cycling up to 148 kelvin, water B remained kinetically and thermodynamically distinct from water A. The occurrence of these two states, which do not interconvert, helps explain both the configurational relaxation of water and stress-induced amorphization.
Johari
GP
G. P. Johari, Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada. A. Hallbrucker and E. Mayer, Institut fur Allgemeine, Anorganische und Theoretische Chemie, Universitat Innsbruck, A-6020 Innsbruck, Austria.
Hallbrucker
A
Mayer
E