These 1975 phase diagrams are generally incomplete, reaching at most 250 kbar (25 GPa) and thus lacking many high-pressure metallic phases.  Taken from "Phase Diagrams of the Elements", David A. Young, UCRL-51902 "Prepared for the U.S. Energy Research &amp; Development Administration under contract No. W-7405-Eng-48".  From the document, "DISTRIBUTION OF THIS DOCUMENT IS UNLIMITED"; printed copies were available from the <a href="https://en.wikipedia.org/wiki/National_Technical_Information_Service" class="extiw" title="w:National Technical Information Service">w:National Technical Information Service</a>.
David A. Young
1975-09-11
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