Accession Number : ADA297828

Title :   The Crystal Structure of Gamma Plutonium,

Corporate Author : LOS ALAMOS SCIENTIFIC LAB ALBUQUERQUE NM

Personal Author(s) : Zachariasen, W. H.

PDF Url : ADA297828

Report Date : SEP 1951

Pagination or Media Count : 11

Abstract : The crystal structure is known for only two of the five allotropic forms of plutonium metal. The delta modification is cubic face-centered with a = 4.63 A (at 350 deg C), and the epsilon form is cubic body-centered with a = 3.63 A (at 5l0 deg C). Satisfactory X-ray diffraction patterns of the alpha, beta and gamma forms of plutonium have been available for several years. However, the indexing of these powder patterns has proved to be a very difficult task. The indexing of the pattern of gamma plutonium given in this report succeeded only after a great many hours of intensive work. The patterns of alpha and beta plutonium have not yet been interpreted. Table 1 gives the observed intensities and sine squares as obtained from a powder diffraction pattern of gamma plutonium taken with CuK alpha-radiation at 226 deg C. The alpha sub 1 alpha sub 2 - doublet is separated for sine squared theta > 0.400, and the measurements refer to the stronger component. jg p.5

Descriptors :   *CRYSTAL STRUCTURE, *PLUTONIUM, METALS, MODIFICATION, POWDERS, X RAY DIFFRACTION, DIFFRACTION, GAMMA RAYS, PATTERNS.

Subject Categories : Inorganic Chemistry
      Radiation and Nuclear Chemistry
      Crystallography
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE