Field activated combustion synthesis of the silicides of vanadium

Maglia,Anselmi-Tamburini,Milanese,Bertolino,Munir

, p. 108 - 118 (2001)

The synthesis of vanadium silicides was investigated using the field-activated combustion synthesis technique. For all V-Si compounds, self-sustaining combustion reactions could be obtained when fields above a threshold value were imposed. Monophasic products were obtained only for the starting compositions V:Si=1:2 and V:Si=5:3. For all other compositions the reaction produced a polyphasic mixture. No significant variation of phase composition was observed with an increase in field strength. In contrast with other systems, the field was seen to have a weak effect on the combustion macrokinetic parameters. This was interpreted on the basis of the large electrical conductivity of the reaction products, driving a large part of the electric flux away from the reaction front. The reaction mechanism was investigated through the use of quenching experiments. Only the VSi2 and V5Si3 phases were observed in the leading edge of the combustion front, with the other phases forming from solid-solid interactions in the afterburn. These results have been compared with observations relative to the mechanism of silicides formation in isothermal solid-solid and solid-liquid diffusion couples.

Liu, L.,Casadio, S.,Magini, M.,Nannetti, C. A.

, (1995)

Thermoelectric and magnetic properties of Cr1-xVxSi2 solid solutions

Hohl,Ramirez,Palstra,Bucher

, p. 70 - 76 (1997)

Cr1-xVxSi2 solid solutions have been prepared in the range 0≤x≤1. The thermopowers, resistivities, and magnetic susceptibilities of the solid solutions vary smoothly with composition and reveal a continuous transition from degenerate semiconducting (x = 0) to metallic (x = 1) behavior. S2/ρ ratios of the solid solutions are less than those of pure CrSi2. The thermoelectric properties of the solid solutions can be described in terms of a free-electron model, whereas an effective mass of 15 me has to be assumed in order to explain the results 0 magnetic measurements.

Thermodynamics and Kinetics of MSi2 Formation under Shock Compression

Batsanov,Gavrilkin,Markis,Meyers

, p. 103 - 109 (2008/10/08)

Thermodynamic and kinetic features of chemical transformation induced by shock compression are considered using reactions of metals with silicon as a model. The mechanisms and topography of processes that occur under cylindrical geometry of dynamic loading are discussed. The electron microscopy data for the shock compression products are reported.