Neutron Diffraction Study of the Long Range Order in a Single Crystal Cu_2NiZn

概要

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It is evidently shown by neutron diffraction that the alloy Cu_2NiZn forms the long range order after prolonged annealing at 300℃. The observed structure factors of the superlattice reflections with mixed indices are evaluated to be between 0.29 and 0.33×10^<-12> cm. Three structure models, whose unit cells are based upon the original face centered cubic cell containing four atoms, are proposed to interpret the experimental results. A good agreement between the observed and calculated structure factors is found in the following model, i.e., a nickel atom is at the origin, and a zinc and two copper atoms are statistically distributed at the three positions (1/2, 1/2, 0, ∩). Possibility of other two models is also discussed on the basis of the present investigation as well as other physical properties.
東北大学の論文