The Free Energy, Heat, and Entropy of Formation of Thorium Oxyfluoride

Technical Report · Wed Jun 01 00:00:00 EDT 1960

DOI:https://doi.org/10.2172/4152884· OSTI ID:4152884

Darnell, A. J. ^[1]

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1. North American Aviation, Inc., Canoga Park, CA (United States). Atomics International Div.

Thorium oxyfluoride, ThOF_2, decomposes at elevated temperatures to ThO_2,(s) and ThF₄(g). The equilibrium pressure of ThF₄ from the decomposition of ThOF_2, was measured in a Knudsen effusion cell from 1109 to 1286 °K. The pressure of ThF₄ from the decomposition reaction is LogP_(atm) = - $$\frac{17,630 ± 370}{T(°K)}$$ + 9.363 ± 0.302. The free energy, enthalpy, and entropy of formation of ThOF_2,(s) at 298 °K are -371.2 kcal/mole, -389.6 kcal/mole, and -62.0 cal/deg-mole, respectively.

• Research Organization: North American Aviation, Inc., Canoga Park, CA (United States). Atomics International Div.
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• DOE Contract Number: AT(11-1)-GEN-8
• NSA Number: NSA-14-016629
• OSTI ID: 4152884
• Report Number(s): NAA-SR--5045
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
DECOMPOSITION
FLUORIDES
MEASURED VALUES
OXYFLUORIDES
PRESSURE
TEMPERATURE
THERMODYNAMICS
THORIUM FLUORIDES
THORIUM OXIDES