The earlier high-pressure stndy of Cw concenmted on the orientational transition and mom-temperature transformations observed in diamond anvils. This work presents a parl of the T-P phase diagram for solid Cw at pressures up to 20 kbar in the temperahlre range extended to 700 K. A new phase region is outlined herein. The new phase is retained to ambient conditions and preliminarily characterized. The new phase is more dense than the initial Cm by al least 8.5% and less compressible by -1.5 times. Its crystal svucmre is very different from the well known face-centred cubic and simple cubic phases, and its recovely to a cubic phase is associated with an endothermal heat effect of -23 I g-', The nature and the lhemcdynamic stability of the new phase are discussed in connection with polymerization of & molecules, which seem likely.
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