We derive a semiempirical Birch-Murnaghan equation of state (EOS) for solid hydrogen iodide using those of HCl and HBr and a relation between the Debye temperature ${\mathrm{FTHETA}}_D$ and the bulk moduli of the hydrogen halides. This EOS is compared at high pressures with one derived treating HI as iodine hydride.

• Received 15 July 1987

DOI:https://doi.org/10.1103/PhysRevB.36.9301