Accession Number : AD0745839

Title :   Computer Simulation of Split Interstitial Equilibrium Positions and Binding Energies in a Tungsten Crystal.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Tankovich,James Anthony

Report Date : JUN 1972

Pagination or Media Count : 69

Abstract : Computer simulations were performed to locate the equilibrium positions and binding energies of interstitial He, Ne, Ar, Kr, and Xe in a tungsten crystal. Heavy interstitial atoms in tungsten share a lattice site with the atom that normally occupies that site and form what is called a split interstitial. Three characteristic interstitial sites were located relative to each lattice site tested. The distance of the impurity atom from the site was seen to vary roughly inversely with its mass, and the displacement of the lattice atom increased with the mass of the impurity atom. The foreign atom in its interstitial position was tested to determine the minimum initial kinetic energy needed to escape the lattice, as well as the optimum escape direction. (Author)

Descriptors :   (*METAL CRYSTALS, IMPURITIES), (*TUNGSTEN, CRYSTAL DEFECTS), HELIUM, NEON, ARGON, KRYPTON, XENON, CHEMICAL BONDS, CRYSTAL STRUCTURE, COMPUTER PROGRAMS, DAMAGE, RADIATION EFFECTS, ADSORPTION, THESES

Subject Categories : Metallurgy and Metallography
      Crystallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE