λ-PHASE TRANSITIONS IN ICE IH NEAR THE MELTING POINT

Abstract

This study gives our predictions for the thermal expansivity α _p , isothermal compressibility κ _T , and specific heat Cp near the melting point for ice Ih. We calculate those thermodynamic quantities as functions of temperature and pressure near the melting point using the experimental data for the thermal expansivity as a function of pressure from the literature. The Pippard relations are validated by plotting C_p against α _p and also α _p against κ _T linearly close to the melting point in ice Ih. We deduce the values of the slope ∂P _m /∂T from those linear plots, which are very close to the experimental value obtained from the P-T phase diagram of ice Ih along the melting curve.

Keywords:

• λ
• -Transition
• Ice
• Melting point