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.
79 Citations
Synthesis of an orthorhombic high pressure boron phase
- Chemistry, Materials ScienceScience and technology of advanced materials
- 2008
Abstract The densest boron phase (2.52 g cm-3) was produced as a result of the synthesis under pressures above 9 GPa and temperatures up to ∼1800 °C. The x-ray powder diffraction pattern and the…
New high-pressure form of boron is significantly ionic
- Physics
- 2009
The comment of Dubrovinskaia et al. is scientifically flawed. The high-pressure form of boron, discovered by Oganov et al., is indeed new and its bonding has a significant ionic character, as…
High-pressure route to superhard boron-rich solids
- Materials Science
- 2011
Novel superhard phases are expected to be found among various high-pressure polymorphs of light element compounds. Besides diamond-like phases, the icosahedral boron-rich solids are of particular…
Polarized Raman spectroscopy of high-pressure orthorhombic boron phase
- Chemistry
- 2009
We synthesized the single crystals of the orthorhombic (space group Pnnm) boron B28 phase in a multi-anvil press and studied them by means of polarized Raman spectroscopy. Among all possible 42…
Superhard phases of simple substances and binary compounds of the B-C-N-O system: from diamond to the latest results (a Review)
- Chemistry
- 2009
The basic known and hypothetic one- and two-element phases of the B-C-N-O system (both superhard phases having diamond and boron structures and precursors to synthesize them) are described. The…
Superhard semiconducting optically transparent high pressure phase of boron.
- Materials SciencePhysical review letters
- 2009
An orthorhombic (space group Pnnm) boron phase was synthesized at pressures above 9 GPa and high temperature, and it was demonstrated to be stable at least up to 30 GPa, and to be the second hardest elemental material after diamond.
The Beta-Rhombohedral Boron Structure
- Geology
- 1965
All of the essential features of the structure of beta-rhombohedral boron were described in a recent communication; it is appropriate at mis point to elaborate upon some of the general features of…
Comparative review of theoretical and experimental equations of state of orthorhombic boron γ-B28
- Materials Science
- 2011
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…
Boron Modifications Produced in an Induction-Coupled Argon Plasma
- Materials ScienceScience
- 1969
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.
References
SHOWING 1-8 OF 8 REFERENCES
Direct Conversion of Graphite to Diamond in Static Pressure Apparatus.
- Physics, GeologyScience
- 1962
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
- Chemistry
- 1960
Nach einem Uberblick uber die bisher bekannten Bor-Modifikationen werden Versuche beschrieben, durch gemeinsames Zersetzen von BBr3 BeBr2 am gluhenden Tantaldraht Borkristalle mit eingelagertem…
Plenum Press, New York, 1960)
- J. Am. Chem. Soc. 82,
- 1960
DeCarlo for preparing many DeBye-Scherrer x-ray patterns
DeBye-Scherrer Card No. 11-618; see also D. E. Sands and J. L. Hoard
- J. Am. Chem. Soc
- 1957