title: Evidence of the existence of the high-density and low-density phases in deeply-cooled confined heavy water under high pressures.
abstract: The average density of D2O 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 D2O 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.
authors.affiliation: Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Kao-Hsiang
authors.initials: KH
authors.lastname: Liu
authors.affiliation: National Institute of Standards and Technology Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: Leland
authors.initials: L
authors.lastname: Harriger
authors.affiliation: National Institute of Standards and Technology Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: Juscelino B
authors.initials: JB
authors.lastname: Leão
authors.affiliation: Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Sow-Hsin
authors.initials: SH
authors.lastname: Chen