The influence of pressure on the structure of H2O and D2O

In this work, the experimental results of deuterium oxide density at high pressure and in a wide range of temperatures, by means of the pseudo-isochoric method, are presented. A specific stainless steel cell was devised to be used as a pycnometer and filled with variable mass of heavy water. The latter was measured by weighing with an analytical balance and using the substitution method. The volume of the pycnometric cell was measured by the gravimetric method and corrected for the effect of temperature and pressure. Each measurement cycle was performed at constant mass, measuring pressure as a function of temperature at equilibrium. From the mass and volume values, density was calculated according to its definition. Heavy water density was measured for temperatures down to 253 K and for pressures up to 163 MPa, thus both in stable and supercooled metastable states. All terms contributing to the uncertainty in determining the volume and the mass were considered, obtaining an expanded relative uncertainty of deuterium oxide density of 0.04%.

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Experimental densities of subcooled deuterium oxide at pressures up to 160 MPa

Romeo

Lago

Albo

2018

The Journal of Chemical Physics

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A Reference Equation of State for Heavy Water

Herrig

Thol

Harvey

et al. 2018

Journal of Physical and Chemical Reference Data

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An empirical fundamental equation of state (EOS) is presented for fluid heavy water (deuterium oxide, D 2 O). The equation is explicit in the reduced Helmholtz energy and allows the calculation of all thermodynamic properties over the whole fluid surface. It is valid from the melting-pressure curve up to a temperature of 825 K at pressures up to 1200 MPa. Overall, the formulation represents the most accurate measured values and almost all other available data within their experimental uncertainty. In the homogeneous liquid and vapor phase, the expanded relative uncertainties of densities calculated from the EOS are mostly 0.1% or less; liquid-phase densities at atmospheric pressure can be calculated with an uncertainty of 0.01%. The speed of sound in the liquid phase is described with a maximum uncertainty of 0.1%; the most accurate experimental sound speeds are represented within their uncertainties ranging from 0.015% to 0.02%. In a large part of the liquid region, the isobaric heat capacity is represented with an uncertainty of 1%. The uncertainty in vapor pressure is mostly within 0.05%. In the critical region, the uncertainties of calculated properties are in most cases higher than the values above, but the EOS enables a reasonable description of this region. The equation matches available data for the metastable subcooled liquid, and it extrapolates in a qualitatively correct way to extreme values of temperature and pressure. This formulation is the result of an effort to establish a new standard for the thermodynamic properties of heavy water by the International Association for the Properties of Water and Steam.

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The influence of pressure on the structure of H2O and D2O

Cited by 2 publications

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Experimental densities of subcooled deuterium oxide at pressures up to 160 MPa

Experimental densities of subcooled deuterium oxide at pressures up to 160 MPa

A Reference Equation of State for Heavy Water

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