The crystal structure of gamma plutonium /

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.Work performed at Los Alamos Scientific Laboratory under Contract No. W-7405-Eng-36."Date declassified: March 15, 1956"--P. [2]."Report written: September 1951.""LA-1325."Includes bibliographical references (p. 11).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.Mode of access: Internet.This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law