Due: Monday, 6 March 2017, before class.
Consider the same binary system, MF-NF, that you studied for Assignment 3. Choose one composition point on the phase diagram at which you know the activity coefficients.
- Assume that you add 1 mol % of metal M to the system. What are the compositions of M, N, MF, and NF, at thermodynamic equilibrium?
- Same question, but with adding 1 mol % of metal N.
- Assume now that your binary system had a third constituent, an impurity RF, that forms a less stable fluoride (or chloride) than MF or NF. Assume an RF concentration of 2 mol %. What is the equilibrium composition of the salt after addition of 1 mol % of metal M? Pick a specific impurity, for example NiF2.
- Calculate the fluorine potential for each of the three cases.
- State your assumptions.
- State the sources of your thermodynamic data.
Note: I’ll give you grading comments on Assignment 3 by the end of the week. In order to solve this assignment, you can proceed assuming that your activity coefficient values are correct.
Useful references:
- C. F. Baes, ‘The Chemistry and Thermodynamics of Molten Salt Reactor Fuels’, Nucl. Metall., vol. 15, p. 617, (1969).