The U-Co-AI ternary system: Phases formation and isothermal section of the phase diagram at 900 deg C

摘要

Phase relations in the Uranium-Cobalt-Aluminum ternary system have been investigated by X-ray diffraction and scanning electron microscopy. A total number of six ternary phases were found to form in the isothermal section at 900 deg C among which three have been discovered in the present study namely; U2Co6Ali9 (Monoclinic, C2/m, a = 17.4617(3) A, b = 12.0474(2) A, c = 8.2003(1) A, /S = 103.915(1)), U2Co3Al9 (Orthorhombic, Cmcm, a = 12.789(1), b = 7.477(1), c = 9.258(1)), (Hexagonal, P63/mmc, a = 8.6518(2) A, c = 9.2620(2) A). Another new ternary compound: UC0AI4 (Hexagonal, P-62m, a = 9.161(1) A, c = 4.114(1) A was found to form only in as-cast samples.