BxO

Phases Present at High Pressure and Temperature

Varanasi Srikanth, Rustum Roy, Earl K. Graham, Donald E. Voigt

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Boron suboxide compounds are of interest because of their low densities coupled with high hardness. In the present study, we have attempted to determine the nature of the BxO phases that occur in the field defined by pressures of zero to 1.5 GPa, temperature between 1200° and 1700°C, and the compositional range 2/3 x 24. Amorphous boron powder and boric acid B2O3 were the starting reactants for all the runs. The processing of the specimens was carried out in a controlled atmosphere furnace, a hot‐pressing assembly, and in a piston—cylinder high‐pressure apparatus within quasi‐hydrostatic and inductively heated cell assemblies. After processing at elevated temperature and pressure, for compositions over the range 2/3 x 6, B2O3 (identical to the hexagonal starting material) and B6O (R3¯m) were the dominant phases present. For the compositions 6 x 24, B6O and rhombohedral B were the primary phases identified. In general, the hardness of the processed composites was dominated by the occurrence of B6O (approximately equivalent to B4C). However, there is some suggestion of particularly high values of hardness on a very localized scale in specimens near the B22O composition.

Original languageEnglish (US)
Pages (from-to)3145-3147
Number of pages3
JournalJournal of the American Ceramic Society
Volume74
Issue number12
DOIs
StatePublished - 1991

Fingerprint

Hardness
Chemical analysis
Boron compounds
Boric acid
Boron
Processing
Powders
Temperature
Furnaces
Protective atmospheres
Composite materials
boron oxide
boric acid

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Srikanth, Varanasi ; Roy, Rustum ; Graham, Earl K. ; Voigt, Donald E. / BxO : Phases Present at High Pressure and Temperature. In: Journal of the American Ceramic Society. 1991 ; Vol. 74, No. 12. pp. 3145-3147.
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BxO : Phases Present at High Pressure and Temperature. / Srikanth, Varanasi; Roy, Rustum; Graham, Earl K.; Voigt, Donald E.

In: Journal of the American Ceramic Society, Vol. 74, No. 12, 1991, p. 3145-3147.

Research output: Contribution to journalArticle

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