Thermodynamic Analysis of Perspective AlB12 Synthesis Reactions from Industrially Accessible Oxygen-Free Compounds
Journal Title: Фізика і хімія твердого тіла - Year 2017, Vol 18, Issue 3
Abstract
Reactions of aluminum dodecaboride synthesis from oxygen free industrially available boron compounds by interaction of condensed and gaseous aluminum with boron nitride and carbide were the subject of thermodynamic analysis in this work. It was shown, that both reactions are thermodynamically advantageous at low temperatures rather than at high and the probability of their occurrence rises significantly for gaseous aluminum in comparison with condensed aluminum. Calculated values of Gibbs' free energy and equilibrium constants and the analysis of contributions into them clearly demonstrate the advantages of reaction with boron nitride. The probability of polyphase product composition imposes minimum temperature restrictions on the synthesis; it should be carried out at temperatures above 10000C. Hypothetical mechanisms of reactions between aluminum and boron containing compounds differ by the place of interaction any place on the surface of each layer of BN and only open surface of B4C and by the transport of reaction participants in the reaction zone. From the results of analysis, we suggest indicative synthesis conditions: vacuum thermal synthesis to provide oxygen free environment and temperature above 10000C to avoid aluminum diboride formation.
Authors and Affiliations
O. Vasiliev, V. Muratov, T. Duda
Keywords
Related Articles
- EP ID EP263287
- DOI 10.15330/pcss.18.3.358-364
- Views 70
- Downloads 0
Isochronal Annealing of Electron-Irradiated Tungsten Modelled by CD Method: 1D and 3D Model of SIA Diffusivity
The evolution of the microstructure of tungsten under electron irradiation and post-irradiation annealing has been modelled using a multiscale approach based on Cluster Dynamics simulations. In these simulations, both se...
Transformations of Titanium (IV) Butoxide on Magnetite Surface in the Presence of Pluronic P-123
The technique of producing magnetically operated nanocomposites Fe3O4/TiO2 with high specific surface area (to 320 m2/g) was developed. A copolymer poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene g...
Influence of Doping and Two-temperature Annealing on CdTe:Br Defective Subsystem
The influence of impurities and annealing conditions on the electrical properties of single cadmium telluride crystals with bromine doping grown by Bridgman method and annealed in cadmium atmosphere at temperatures T = 8...
The Influence of the Synthesis Temperature on Phase Composition and Structure of Tenary Compounds Obtained from the Powder Mixture of the TiH2-Al-C System
This paper presents results of an investigation of the features of phase and structure formation of a ternary compound during thermal sintering use of compacted TiH2-Al-C powder blends. The thermal sintering was carried...
Theory of Dynamic Conductivity of Three-Barrier Resonance-Tullel Structure with Two-Photon Laser Transitions
Within the approximation of effective mass and rectangular potential barriers for the electron and using the obtained solutions of complete Schrodinger equation, the theory of dynamic conductivity for three-barrier reson...