Electron Compounds of Transition Elements

Abstract

The work of many investigators has strongly indicated that sigma phase is characterized by a certain averaged electronic structure. The characteristic was first thought to be the ``electron vacancy'' concentration in the d band, but it is now appreciated that the density of electrons outside the argon shells may also be a valid criterion. The latter characteristic is used here with the application of H. Jones' theory. The result shows a definite correlation between the homogeneity ranges and the x-ray diffraction patterns for sigma phase and several other complicated structures which occur in alloys of transition metals.

{211}-Slip and Deformation Twinning in 50Fe–50Cr Alloys

“…Owing to the cubic symmetry of the structure, these shifts are described by five parameters only. As discussed by Beattie [13], the A12 structure is closely related to the structure of the s-phase, which is taken up when the 50Fe±50Cr alloy orders at low temperatures. Furthermore, the a-Mn structure has in common with the twinning in b.c.c.…”