Accession Number : AD0483951

Title :   RATE OF GROWTH OF MAGNESIUM OXIDE DEPOSITS FORMED BY SURFACE REACTION OF MAGNESIUM VAPOR AND OXYGEN.

Descriptive Note : Technical rept.,

Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE

Personal Author(s) : Markstein, George H.

Report Date : APR 1966

Pagination or Media Count : 24

Abstract : The rate of increase of the thickness of MgO deposits growing by heterogeneous reaction of Mg vapor and O2 was measured. The deposits were formed on metal mirror surfaces that were prepared by vapor deposition of gold on glass slides. Interference fringes observed in sodium light were recorded photographically at time intervals suitable for measuring the rate of deposit growth. Under the conditions of the majority of the present experiments, the growth rates were found to be diffusion-controlled. Under these conditions, a lower limit of 0.07 was computed for the collision efficiency with respect to magnesium concentration. Preliminary experiments in the transition region between diffusion and chemical control indicate a highly collision efficiency, probably exceeding 0.3. (Author)

Descriptors :   *OXIDES), (*MAGNESIUM COMPOUNDS, (*VAPORS, DEPOSITION), MAGNESIUM, OXYGEN, CHEMICAL REACTIONS, SURFACES, TEMPERATURE, REACTION KINETICS, CONTROL, TEST METHODS, MEASUREMENT.

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE