Titanium nitride was deposited from the reactant gases H2, N2, and TIC14 at atmospheric pressure. The weight change of the sample was noted by means of a thermobalance. Stainless steel was used as the substrate. It has been found that the deposited film is TiN by the use of x-ray diffraction. Under experimental conditions of minimal influence by mass-transport control, the deposition rate was in proportion to the square root of the partial pressures of hydrogen and nitrogen, respectively. The deposition rate decreased with increasing partial pressure of TIC14 under the experimental conditions employed in this study. By comparing these results with Langmuir-Hinshelwood--type equations, it has been suggested that the probable rate-controlling step is the reaction of hydrogen atoms with nitrogen atoms on the reaction surface or the adsorption of hydrogen molecules and that of nitrogen molecules on the surface. The extent of surface coverage by these atoms is considered to have been reduced when the partial pressure of TIC14 is increased, due to competitive adsorption.
High energy x-ray diffraction measurements have been performed on CaO-Al 2 O 3 liquids suspended in a flow of pure argon for six compositions containing 50-67 mol% CaO. The results indicate that AlO 4 tetrahedra dominate the liquid structure. The radial distribution functions show a significant broadening of the Ca-O peak occurs in the liquid compared to the corresponding glass and, on average, each Ca is surrounded by approximately five oxygen atoms in the melt at a distance of 2.3Å. It is also found that the structure for the eutectic (64% CaO) liquid does not change measurably with temperature between 1600 and 1970 • C.
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