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  1. The Separation of Cold-Work Distortion and Particle Size Broadening in X-Ray Patterns

    Warren, B. E. ; Averbach, B. L. - Journal of Applied Physics
    For a cubic crystal it is always possible to choose orthogonal axes so as to make any reflection have the indices (00$$\wr$$). Further, it has been shown, that for either distortion broadening or particle size broadening, the shape of the diffraction peak can be represented by a Fourier series.

  2. The Synthesis of Heterocyclic Nitrogen-containing Ketones. I. Ketones Derived from 2-Picoline

    Goldberg, Newton N. ; Barkley, Lloyd B. ; Levine, Robert - Journal of the American Chemical Society
    2-Picolyllithium, prepared from 2-picoline and phenyllithium, has been acylated in good yields with methyl benzoate, 2-furoate, 2-thiophenate, acetate, propionate and isovalerate and ethyl benzoate and isobutyrate. Finally, in addition to the 2-picolyl ketones, alkyldi-2-picolylcarbinols were isolated in those experiments in which aliphatic esters were used as the acylating reagents.

  3. Atomic displacements and crystallographic mechanisms in diffusionless transformation of gold–cadium single crystals containing 47.5 atomic percent cadmium

    Chang, Lo -Ching - Acta Crystallographica
    In this work, the atomic displacements and crystallographic mechanism in diffusionless transformation of Au-Cd single crystals containing 47.5 atomic percent Cd have been investigated. The alloy transforms from an ordered body-centered cubic structure (β1) on cooling to about 60° to an orthorhombic structure (B'). The reverse transformation from β' to β1 takes place when the alloy is heated to about 80°. The lattice parameters of both phases determined by X-ray measurements are: β1: ∝= 3.3165 ± 0.0005 kX. (corrected to room temperature); β': a = 3.1476 ± 0.0005, b = 4.7549 ± 0.0005, c = 4.8546 ± 0.0005 kX. Atomicmore » displacements involved in the transformation are discussed and transformation matrices are derived. The crystallographic mechanism of the transformation was experimentally evaluated as a $$(\overline{3}31)$$β1 [323]β1 simple homogeneous shear of about 3 degrees (tan γ0 = 0.05), plus a possible contraction of the b edge of the orthorhombic cell by about 0.015 kX. units. The lattice parameters of the orthorhombic phase calculated according to this crystallographic mechanism, are in almost exact agreement with those directly obtained by X-ray measurements.« less

  4. High-Energy Fission of U 238

    Sugarman, Nathan ; Münzel, Helmut ; Panontin, J. A. ; ... - Physical Review

  5. Positron-Electron Differences in Energy Loss and Multiple Scattering

    Rohrlich, F. ; Carlson, B. C. - Physical Review
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