THE THERMODYNAMICS OF M-CENTER FORMATION.
OREGON STATE UNIV CORVALLIS DEPT OF CHEMISTRY
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The equilibrium between F centers and M centers in additively colored KC1 was studied at temperatures between 60C and 130C. The M-center concentration at equilibrium varied approximately as the square of the F-center concentration, verifying the stoichiometric equation 2F M. At 60C, the equilibrium constant was 1.7 x 10 to the-19th power cu.cm. Enthalpy change -4.1 Kcal and entropy change -98 caldeg, for the standard state one center cu.cm. The entropy change value agrees with that calculated from the configurational entropy, i.e., R 1n 6N, where N is the concentration of negative ion sites. Author
- Solid State Physics