title: Temperature-pressure phase diagram of a D2O-D2 system at pressures to 1.8 kbar.
abstract: Using a volumetric technique, the deuterium solubility, X, in heavy water (L), low-pressure hexagonal ice (I h), and high-pressure cubic clathrate ice (sII) is studied at deuterium pressures up to 1.8 kbar and temperatures from -40 to +5 degrees C. The triple point of the L + I(h) + sII equilibrium is located at P = 1.07(3) kbar and T = -4.5(8) degrees C. The molar ratios D2/D2O of phases at the triple point are X(L) = 0.020(5), X(Ih) = 0.012(5), and X(sII) = 0.207(5).
authors.affiliation: Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow District, Russia. efimchen@issp.ac.ru
authors.forename: Vadim S
authors.initials: VS
authors.lastname: Efimchenko
authors.forename: Vladimir E
authors.initials: VE
authors.lastname: Antonov
authors.forename: Oleg I
authors.initials: OI
authors.lastname: Barkalov
authors.forename: Semen N
authors.initials: SN
authors.lastname: Klyamkin