Influence of positions of boron, carbon, and nitrogen atoms in the FCC lattice of iron on the characteristics of interatomic interaction

A semi-empirical model is proposed for calculating the characteristics of interatomic forces for virtualFeB, FeC, andFeN compounds on the basis of their electronic structure as functions of the positions of interstitial atoms. On the example of these compounds the universal character of the dependence of the bulk modulus of elasticity on the electronic density in the interspherical space found previously derived earlier in the literature for pure base and transition metals has been demonstrated. It has been found that the arrangements ofB, C, andN atoms in the octahedral interstices are energetically more favorable in comparison with their arrangements in the tetrahedral interstices. The influence of individual properties of the interstitial elements on the calculated quantities is analyzed. V. D. Kuznetsov Siberian Physical-Technical Institute at the Tomsk State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 40–44, April, 1999.     

Kinetics of Reaction of Aluminum Hydroxide with Dimethyl Hydrogen Phosphite in Nitrobenzene

The kinetics of the reaction of aluminum hydroxide with dimethyl hydrogen phosphite in nitrobenzene was studied.     

Controlling the sonic boom from a thin body by means of local heating of the incoming flow

The problem of reduction of the sonic boom level by heating the flow in front of the body is solved numerically. A combined method of “phantom bodies” is used for calculations. The sonic boom generated by an axisymmetric thin body for the flight Mach number of 2 with different levels of energy supply to the incoming flow is calculated. The calculation results show that the sonic boom can be reduced by means of local heat supply to a supersonic gas flow. Reduction of the sonic boom level is provided by specific gas-dynamic features of the flow behind the heat supply zone.     

Relationship between the atomic characteristics of boron, carbon, and nitrogen, and their effect on the electronic structure of fcc iron

Unified approximations are used to calculate the electronic structure of iron alloys with B, C, and N. Calculations are performed for the lattice parameter of fcc iron and for the lattice parameter after relaxation in accordance with an empirical relation for solid solutions. Laws are found that relate mutual perturbations of the states of the components to the position of the interstitial elements in the periodic table. V. D. Kuznetsov Siberian Physico-Technical Institute, Tomsk University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 103–110, June, 1998.