Accession Number : ADA307011

Title :   Kinetic Effects in the Chemistry of Diamond CVD Source Gases and Implications for Diamond Growth,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC CENTER FOR REACTIVE FLOW AND DYNAMICAL SYSTE MS

Personal Author(s) : Sinkovits, Robert S. ; DeVore, C. R. ; Shamamian, Vasgen A.

PDF Url : ADA307011

Report Date : 22 MAR 1996

Pagination or Media Count : 44

Abstract : Perfectly stirred reactor calculations have been carried out on six different gas mixtures containing ethanol, water, methane, acetylene, oxygen, and hydrogen at conditions typical of low-pressure (approx. 1 Torr) diamond chemical vapor deposition (CVD) reactors. For reactors operating under conditions in which the flow or diffusive time scales are short compared to the chemical time scales, the selection of viable source-gas mixtures for diamond growth based solely on the overall C-H-O stoichiometry becomes impossible and kinetic effects must be taken into account. Numerical results are presented which show the dependence of the maximum theoretical diamond deposition rate and diamond quality as a function of mass flow rate.

Descriptors :   *GROWTH(GENERAL), *DIAMONDS, *CHEMICAL VAPOR DEPOSITION, *GASES, *CHEMISTRY, *KINETICS, SOURCES, CHEMICALS, WATER, NUMERICAL ANALYSIS, HYDROGEN, MIXTURES, TIME, OXYGEN, MASS FLOW, FLOW RATE, SCALE, HYDROCARBONS, ACETYLENE, METHANE, STOICHIOMETRY, REACTOR OPERATION, ETHANOLS.

Subject Categories : Inorganic Chemistry
      Organic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE