Melting of Iodine at High Pressures

Abstract
The melting curve of iodine, which has been determined by differential thermal analysis, monotonically increases from about 114°C at zero pressure to about 590°C near 30 kbar. The extrapolated zero‐pressure slope for the melting curve is consistent with the value of 27.2 deg/kbar, as calculated from zero‐pressure data for the volume and entropy changes, and with the 27.8‐deg/kbar value from the unpublished data of Babb; near 30 kbar, the slope is about 11 deg/kbar. To a good approximation, the melting characteristics of the isostructural elements—iodine, bromine, and chlorine— should be quite similar, and the data for these other halogens are examined in an effort to anticipate their behavior at high pressure.

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