Boron: Another Form

@article{Wentorf1965BoronAF,
  title={Boron: Another Form},
  author={Robert H. Wentorf},
  journal={Science},
  year={1965},
  volume={147},
  pages={49 - 50}
}
A hitherto undescribed form of boron can be prepared by subjecting ordinary forms of boron to pressures exceeding about 100 kilobars and temperatures between about 1500� to 2000�C. The new form has a density of about 2.52 g/cm3 and yields a characteristic DeBye-Scherrer pattern. No large crystals have been prepared. 
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TLDR
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Comparative review of theoretical and experimental equations of state of orthorhombic boron γ-B28
AbsractVarious theoretical and experimental 300 K equations of state of γ-B28, a new ultrahard high pressure orthorhombic phase of boron, have been reviewed. Throughout analyses and critical…
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Most of the small particles of microcrystalline β-rhombohedral boron that quickly transit an argon plasma maintained within a radio-frequency induction-coupled torch emerge as better crystallized spheroids of the same crystalline form and nearly the same size as the starting material.
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References

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Direct Conversion of Graphite to Diamond in Static Pressure Apparatus.
TLDR
At pressures above about 125 kbar and temperatures in the 3000°K range it is found that graphite spontaneously collapses completely to polycrystalline diamond which may be retrieved quantitatively.
Über die Modifikationen des Bors. Versuche zur Einlagerung von Beryllium in das Borgitter
Nach einem Uberblick uber die bisher bekannten Bor-Modifikationen werden Versuche beschrieben, durch gemeinsames Zersetzen von BBr3 BeBr2 am gluhenden Tantaldraht Borkristalle mit eingelagertem…
RHOMBOHEDRAL ELEMENTAL BORON
An Analysis of Polymorphism in Boron Based upon X-Ray Diffraction Results1
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DeCarlo for preparing many DeBye-Scherrer x-ray patterns
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