Accession Number : AD0609814

Title :   RATE OF SUBLIMATION OF AMMONIUM HALIDES,

Corporate Author : AEROJET-GENERAL CORP AZUSA CALIF

Personal Author(s) : Chaiken,R. F. ; Sibbett,D. J. ; Sutherland,J. E. ; Van de Mark,D. K. ; Wheeler,A.

Report Date : MAR 1962

Pagination or Media Count : 31

Abstract : The rates of sublimation of ammonium chloride, bromide, iodide and fluoride have been determined by two different experimental techniques over the temperature range of 100 to 600C, corresponding to an increase in sublimation rate of .0010. The two experimental methods employed were the isothermal rate of weight loss, using a quartz spring balance, and the hot-plate linear pyrolysis method. The low activation energy (about one-third the heat of sublimation) found for ammonium chloride by earlier investigators has been verified and found to extend to the other halides. The frequency factor is also abnormally low for the ammonium halides, by a factor of roughly .001, with the exception of the fluoride, for which the factor is only about 500. These results are in fair agreement with the Schultz-Dekker mechanism for ammonium halide sublimation. (Author)

Descriptors :   (*AMMONIUM COMPOUNDS, HALIDES), (*HALIDES, SUBLIMATION), (*SUBLIMATION, AMMONIUM COMPOUNDS), CHLORIDES, BROMIDES, IODIDES, FLUORIDES, TEMPERATURE, HEAT OF SUBLIMATION, TEST METHODS, QUARTZ, SPRINGS, BALANCES, VACUUM APPARATUS, LINEAR SYSTEMS, PYROLYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE