INVESTIGATION OF THE SYSTEM BERYLLIUM-BORON

Journal Article · Tue Aug 01 04:00:00 EDT 1961 · Journal of the American Ceramic Society (U.S.)

DOI:https://doi.org/10.1111/j.1151-2916.1961.tb15468.x· OSTI ID:4003040

Hoenig, C L; Cline, C F; Sands, D E

Mixtures of beryllium and boron powders were reacted under argon at elevated temperatures. X-ray, singlecrystal, and powder diffraction analyses, chemical analyses, and Knoop micro-hardness measurements were made. Melting- point ranges were established for compounds of reasonable purity. One compound was identified. Beryllium diboride (BeB/sub 2/) has a hexagonal unit cell. Its hardness was 3180 plus or minus 100 (H/sub K10//sub 0/), and its melting point was greater than 1970 deg C. Beryllium hexaboride (BeB/sub 6/) has a tetragonal unit cell, a hardness of 2577 plus or minus 75 (H/sub K10//sub 0/), and a melting poin t between 2020 deg and 2120 deg C. An anisotropic unknown phase existed whose Be: B ratio was between 6: 1 and 2: 1 and whose hardness ranged between 623 and 917 (H/sub K2/>i/sub 5/), depend->s ing on orientation. A eutectic between beryllium and the unknown phase was observed at 972 deg plus or minus 15 deg C. (auth)

• Research Organization: Univ. of California, Livermore
• NSA Number: NSA-15-026572
• OSTI ID: 4003040
• Report Number(s): UCRL-5855; 0002-7820
• Journal Information: Journal of the American Ceramic Society (U.S.), Journal Name: Journal of the American Ceramic Society (U.S.) Vol. Vol: 44; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

ALLOTROPY
ANISOTROPY
ARGON
BERYLLIUM
BERYLLIUM COMPOUNDS
BORIDES
BORON
CHEMICAL REACTIONS
DIFFRACTION
EUTECTICS
HARDNESS
HIGH TEMPERATURE
LATTICES
MEASURED VALUES
MELTING POINTS
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
MONOCRYSTALS
POWDERS
QUALITATIVE ANALYSIS
X RADIATION