Abstract
Crystal structures of palladium-manganese alloys with compositions in the neighborhood of 25at.%Mn have been studied, and it has been confirmed that the alloys with manganese less than about 24at.% have the disordered F.C.C. lattice and those with the manganese contents ranging from about 24 to 30at.% the one-dimensional long period ordered structure with M =2. Refinement of the structure analysis of the long period ordered alloy Pd 3 Mn by X-ray diffraction has been made using single crystals, and periodic atom displacements of the heavy and light atoms have been found to occur with displacement directions similar to those in Cu 3 Pd(α''), the magnitude of displacements being as small as 0.01A for both the kinds of atom. These atom displacements are discussed in relation to the electron-atom ratio of the alloy. Neutron diffraction powder patterns have been observed, in order to see whether the nuclei in Pd 3 Mn are displaced together with the electron clouds belonging to them or not, but no definite conc...
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