Evidence of the existence of the high-density and low-density phases in deeply-cooled confined heavy water under high pressures

Journal Article · Mon Jul 07 00:00:00 EDT 2014 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4885844· OSTI ID:22308754

Wang, Zhe; Chen, Sow-Hsin ^[1]; Liu, Kao-Hsiang ^[1]; Harriger, Leland; Leão, Juscelino B. ^[2]

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1. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
2. National Institute of Standards and Technology Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)

The average density of D{sub 2}O confined in a nanoporous silica matrix (MCM-41-S) is studied with neutron scattering. We find that below ∼210 K, the pressure-temperature plane of the system can be divided into two regions. The average density of the confined D{sub 2}O in the higher-pressure region is about 16% larger than that in the lower-pressure region. These two regions could represent the so-called “low-density liquid” and “high-density liquid” phases. The dividing line of these two regions, which could represent the associated 1st order liquid-liquid transition line, is also determined.

• OSTI ID: 22308754
• Journal Information: Journal of Chemical Physics, Vol. 141, Issue 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DENSITY
HEAVY WATER
LIQUIDS
NEUTRON DIFFRACTION
SILICA