Hydrogen Reduction of MoF6 and Molybdenum Carbide Formation in RF Inductively Coupled Low-Pressure Discharge: Experiment and Equilibrium Thermodynamics Consideration
| Autor: | V. S. Polyakov, V. V. Nazarov, Petr G. Sennikov, I. B. Gornushkin, V. E. Shkrunin, R. A. Kornev |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Argon Hydrogen Plasma parameters General Chemical Engineering Analytical chemistry chemistry.chemical_element General Chemistry Low-pressure discharge Condensed Matter Physics 01 natural sciences Methane 010305 fluids & plasmas Surfaces Coatings and Films Amorphous solid chemistry.chemical_compound Equilibrium thermodynamics chemistry Molybdenum 0103 physical sciences |
| Zdroj: | Plasma Chemistry and Plasma Processing. 41:673-690 |
| ISSN: | 1572-8986 0272-4324 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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