THE VAPOR PRESSURES OF SOME HEAVY TRANSITION-METAL HEXAFLUORIDES
The vapor pressures of the hexafiuorides of tungsten, molybdenum, rhenium, osmium, and iridium were measured by a static method using a diaphragm gauge of high sensitivity. Hitherto unknown solid-solid transitions are reported for rhenium, osmium, and iridium hexafluorides together with those known for tungsten and molybdenum hexafluorides. These are, respectively: - 1.9 deg , - 0.4 deg , +0.4 deg , -8.2 deg , and -8.7 deg . From the vapor-pressure data more accurate physical constants, latent heats of vaporization and sublimation, heats of fusion and transition, and entropies of fusion, transition, and vaporization were calculated. Nuclear magnetic resonance studies with both solid and liquid hexafluorides suggest that there is molecular rotation in the solid state above the transition point. (auth)
- Research Organization:
- Univ. of Washington, Seattle
- NSA Number:
- NSA-15-018051
- OSTI ID:
- 4029991
- Journal Information:
- Journal of the Chemical Society (England) Divided into J. Chem. Soc. A, J. Chem. Soc. B, etc., Journal Name: Journal of the Chemical Society (England) Divided into J. Chem. Soc. A, J. Chem. Soc. B, etc.; ISSN JCSOA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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