Accession Number : AD0427999

Title :   CHRONOPOTENTIOMETRIC STUDY OF ANIONIC DIFFUSION IN THE POTASSIUM-LIQUID AMMONIA SYSTEM.

Descriptive Note : Technical progress rept.,

Corporate Author : NEW YORK UNIV N Y

Personal Author(s) : Gordon,Roger P.

Report Date : JAN 1964

Pagination or Media Count : 23

Abstract : A chronopotentiometric study was made of anion diffusion in solutions of potassium in liquid ammonia ranging in concentration from <0.01M to >0.1M in the presence of excess KI. Diffusion coefficients for the electron of the order of 5 x 10 to the -5th power sq cm/sec were obtained. Measurements were also made in the absence of supporting electrolyte and led to apparent integral diffusion coefficients of the order of 5 x 10 to the -4th power sq cm/sec. The capacitance of the double layer was determined by the ''galvanostatic charging'' method and found to be about 65 microfarads/sq cm. Diffusion activation energies were calculated and found to vary both with concentration and with temperature from 2-9 Kcal/mole or more. The results are interpreted in terms of an electron transport mechanism. It is shown that the height of the electron ''conduction level'' must vary in a surprising manner with concentration and that the tunnel effect transport mechanism is enhanced by increasing the temperature. Explanation for these effects are suggested. (Author)

Descriptors :   (*POTASSIUM, DIFFUSION), (*AMMONIA, SOLUTIONS(MIXTURES)), (*DIFFUSION, POTASSIUM), LIQUEFIED GASES, ELECTROCHEMISTRY, POTASSIUM, IODIDES, ELECTRIC DOUBLE LAYER, HEAT OF ACTIVATION, IONS, TRANSPORT PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE