Abstract
In order to present the phase relation in Pd-rich Pd-Mn alloys, we investigated the ordered structures on the basis of transmission electron diffraction and microscopy studies. Among various ordered phases reported up to now, four of Pd 3 Mn (D0 2 3 ), Pd 2 Mn, Pd 5 Mn 3 and PdMn (L1 0 ) phases were confirmed to be stable, but no indications of Pd 3 Mn (L1 2 ) and Pd 2 1 Mn 1 1 phases were obtained. In the region of 1d-APS from Pd 3 Mn to about 35 at% Mn, c 0 /a 0 gradually decreased from unity with increasing Mn content, indicating the deviation of structure from D0 2 3 . The value of M of the Id-APS was 2.00 up to about 30 at% Mn irrespective of annealing temperature, and then gradually increased to 2.87 with increasing Mn and elevating temperature. Controversial results on M reported by different investigators are ascribed to the annealing temperature as well as composition dependence of M. The structural models reported for Pd 2 Mn and Pd 5 Mn 3 phases were supported by the present study. We finally propose a partial atomic phase diagram in Pd-rich region.
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