Abstract
Abstract A molybdenum sheet was selenidized at a selenium vapor pressure of 0.40—13.3 kPa at 773—973 K by means of a sealed-tube method. X-Ray diffraction patterns and an electron probe microanalysis of the product films showed that a single layer comprising MoSe2 was formed under all of the selenidization conditions employed. All of the selenidizations obeyed a parabolic rate law and, therefore, the rate-determining step was apparently a diffusion process. The parabolic rate constant (Kp) was expressed as a function of the absolute temperature, and the selenium vapor-pressure dependence of Kp could be clearly recognized. A marker experiment indicated that selenium was the component which diffused.
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