THE DEHYDRATION OF GYPSUM. PART II. THE OXIDATION KINETICS OF TANTALUM IN CARBON DIOXIDE

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Abstract:

The dehydration of both polycrystalline and single crystal samples of gypsum was studied in the temperature range 99 to 142 C by means of visual observation, infrared spectroscopy, X-ray diffraction, and thermogravimetric techniques. Samples of Ta were oxidized in CO2AT VARIOUS PARTIAL PRESSURES IN THE TEMPERATURE RANGE 700 TO 950 C and in CO2-CO mixtures in the range 760 to 820 C. The reaction involved linear oxidation which was associated with the formation of a nonprotective layer of Ta2O5. Below about 720 C, there was a change in the rate-determining mechanism, and above 840 C the linear reaction was preceded by a region of nonlinear oxidation. Author

Author(s):
Richards, Kenneth J.
Author Organization(s):
UTAH UNIV SALT LAKE CITY
Pagination:
0001

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DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*GYPSUM, *TANTALUM, CARBON COMPOUNDS, CARBON DIOXIDE, CRYSTALS, DEHYDRATION, GRAVIMETRIC ANALYSIS, HIGH TEMPERATURE, INFRARED SPECTROSCOPY, MEASUREMENT, MONOXIDES, OXIDATION, REACTION KINETICS, SINGLE CRYSTALS, TEMPERATURE, THERMODYNAMICS, X RAY DIFFRACTION
Report Date:
1962 Aug 01