PHOSPHIDES OF THE B 31 (MNP) STRUCTURE TYPE
UPPSALA UNIV (SWEDEN)
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The mono-phosphides of Cr, Mn, Fe, Co, W, and Ru crystallize in the B 31 MnP structure type. The unit cell dimensions of these phosphides were measured, and the structures of MnP, FeP and CoP were determined accurately by single-crystal methods. Some data for unit cell variations accompanying isomorphous substitution are presented and discussed. Among the phosphides, CoP is the only B 31 K phase. The author found complete solid solubility of FeP, MnP and CrP in CoP. The compositions for the alloys with cb 3 to the 12 power were approximately Co0.6 Fe0.4P, Co0.8 Mn0.2P, and Co0.87Cr0.13P, which implies that the number of electrons is roughly constant at this cb ratio. The unit cell dimensions for B 31 phases are dependent on electronic factors. The data from the structure determinations did not indicate any marked structural difference between B 31 1 and B 31 k phases.