XLIX. Brillouin Zones of some intermetallic compounds

Summary Data on Brillouin Zones for nine aluminium-rich compounds of iron have been obtained by x-ray analysis. For binary compounds and a ternary compound with nickel, the data can be correlated by assuming a reasonable electron absorption by iron, in agreement with previous results for alloys of cobalt and nickel. For ternary compounds containing copper and silicon, such correlation is not possible as the absorption required is obviously too high. Similar difficulties are encountered with some manganese compounds. It is suggested that the presence of a set of very strong x-ray reflexions at nearly the same spacings is not a sufficient criterion for classifying these complex phases as electron compounds.