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Hydrogen Reduction of MoF6 and Molybdenum Carbide Formation in RF Inductively Coupled Low-Pressure Discharge: Experiment and Equilibrium Thermodynamics Consideration |
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| Authors: | Sennikov P G Gornushkin I B Kornev R A Nazarov V V Polyakov V S Shkrunin V E |
| Institution: | 1.G. G. Devyatykh Institute of Chemistry of High-Purity Substances of RAS, 49 Tropinin Str, Nizhny Novgorod, Russia, 603951 ;2.BAM Federal Institute for Materials Research and Testing, Richard-Willst?tter-Strasse 11, 12489, Berlin, Germany ;3.Institute of Applied Physics of RAS, 46 Ulyanov Str, Nizhny Novgorod, Russia, 603951 ; |
| Abstract: | The physical plasma parameters, temperature and electron number density, are studied in the RF-IC (RF inductively coupled) discharge at a reduced pressure of 3 Torr in mixtures of MoF6 with Ar, H2 and CH4. The emission spectra of mixtures are investigated. It is shown that in the presence of argon, the concentration of free electrons in plasma and dissociation rate of MoF6 increase. A main role of molecular hydrogen is the generation of atomic hydrogen that binds atomic fluorine and leads to the formation of gaseous and solid products. Exhaust gas mixtures exiting the reactor are analyzed by mass spectrometry. It is shown that for all cases, the conversion of MoF6 into reaction products is close to 100%. A thermodynamic analysis of the equilibrium composition of MoF6 systems with Ar, H2 and CH4 was carried out and the obtained results are in good agreement with experimentally observed composition of the solid and gas phases. Analysis of solid deposits from mixture MoF6/H2/Ar revealed the presence of molybdenum powder and large amount of amorphous MoFx. The deposit obtained from mixtures with methane, MoF6/H2/Ar/CH4, contained crystalline molybdenum carbide, Mo3C2. |
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