  Gibbs energy representations for ice III, V and VI are reported. These were
constructed using new measurements of volumes at high pressure over a range of
low temperatures combined with calculated vibrational energies grounded in
statistical physics. The collection of representations including ice Ih and
water (released as the open source SeaFreeze framework) allow accurate
determinations of thermodynamics properties (phase boundaries, density, heat
capacity, bulk modulus, thermal expansivity, chemical potentials) and seismic
wave velocities over the entire range of conditions encountered in hydrospheres
in our solar system (220 - 500K to 2300 MPa). These comprehensive
representations allow exploration of the rich spectrum of thermodynamic
behavior in the H2O system. Although the results are broadly applicable in
science and engineering, their use in habitability analysis in water-rich
planetary bodies of our solar system and beyond is particularly relevant.
