The effects of niobium addition on a completely austenitic stainless steel matrix consisting of Fe‐15%Cr‐15%Ni, with about 0, 0.5, 1 and 2% niobium, were studied by determination of stacking fault energies by means of X‐ray diffraction analysis. A strong influence of niobium on stacking‐fault energies was found, whose behaviour can be explained as being due to decrease in the electron/atom ratio and increase in the L. Pauling electron vacancy number of austenitic Fe‐Cr‐Ni matrix brought on by niobium.

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The Fe-Ni ordered alloy with superstructure Llo was extracted from the metal particles of LL-chondrite St. Skverln and characterized by Mossbauer Spectroscopy to be a single phase. Five superlattice lines corresponding to the 1-10 superstructure were identified in the X-ray powder diagram.

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