KINETICS OF THE ATTACK OF MOLYBDENUM BY DISSOCIATED CHLORINE
Abstract
The true kinetics of the attack of molybdenum surfaces by both atomic and diatomic chlorine were studied using microwave discharge fast-flow system techniques coupled with electrical resistance heating and monitoring of the reacting specimens. Experimental results are reported over the surface temperature range from 400K to 1530K, at reactant partial pressures of the order of 0.001 to 0.1 Torr. In contrast to the behavior of nickel, dissociation markedly increases the chlorination probability of molybdenum over the entire temperature range investigated, the enhancement being of the order of 100-fold at about 1000K. The high reaction probability for Cl2(g) attack of high temperature nickel was verified. When exposed to dissociated chlorine the ratio of the nickel chlorination rate to the Cl-atom recombination rate decreases with decreasing surface temperature-on 420K nickel filaments the recombination coefficient was found to be 1/2. The implications of these results with regard to dissociative adsorption and evaporation on/from nickel and molybdenum surfaces are discussed in the light of available kinetic and thermochemical data for these and related heterogeneous reactions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1965
- Accession Number
- AD0624543
Entities
People
- Daniel E. Rosner
- H. D. Allendorf