The large disagreement in the previously measured melting curves of H2O above 20 GPa may be explained by new measurements in the laser-heated diamond cell, revealing a transition from ice VII to a new solid phase. This transition was most likely interpreted as melting in previous melting experiments due to the observed loss of Raman or X-ray signals. The structure of this new phase will therefore be difficult to indentify.
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Schwager et al. (2008) studied this question.
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