Accession Number : AD0636316

Title :   THE THERMODYNAMICS OF M-CENTER FORMATION.

Descriptive Note : Technical rept.

Corporate Author : OREGON STATE UNIV CORVALLIS DEPT OF CHEMISTRY

Personal Author(s) : Zahrt, John D. ; Scott,Allen B. ; Coker,E. H.

Report Date : 10 JUL 1966

Pagination or Media Count : 19

Abstract : 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 cal/deg, for the standard state one center cu.cm. The entropy change value agrees with that calculated from the configurational entropy, i.e., R 1n 6/N, where N is the concentration of negative ion sites. (Author)

Descriptors :   (*COLOR CENTERS, *THERMODYNAMICS), (*POTASSIUM COMPOUNDS, *CHLORIDES), ALKALI METAL COMPOUNDS, HALIDES, CRYSTAL DEFECTS, CONCENTRATION(CHEMISTRY), ENTHALPY, ENTROPY, IONS, CHEMICAL EQUILIBRIUM

Subject Categories : Solid State Physics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE