Sublimation of boron
Journal Article
·
· High Temp. Sci.; (United States)
OSTI ID:7212259
- Sandia Labs., Livermore, CA
Torsion-effusion and mass spectrometric techniques were used to study the vaporization of ..beta..-rhombohedral boron over the temperature range 1823 to 2253/sup 0/K. The pressure-temperature data were fitted by the equation ln P (Pa) = -(66.8 +- 1.4)10/sup 3/T/sup -1/ + (29.99 +- 0.64). Heats of sublimation derived by second-law and third-law treatments of the torsion data yielded ..delta..H/sub 298//sup 0/ = 563.6 + 33.4 and 561.1 +- 3.3 kJ/mole, respectively, where the errors are estimated accuracies. The mass spectrometer data gave ..delta..H/sub 298//sup 0/ = 566.1 +- 14.3 kJ/mole. Free surface sublimation experiments were carried out, and an evaporation coefficient of unity was observed.
- OSTI ID:
- 7212259
- Journal Information:
- High Temp. Sci.; (United States), Journal Name: High Temp. Sci.; (United States) Vol. 8:4; ISSN HITSA
- Country of Publication:
- United States
- Language:
- English
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