抄録
It is evidently shown by neutron diffraction that the alloy Cu2NiZn forms the long range order after prolonged annealing at 300°C. 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, (Remark: Graphics omitted.)). Possibility of other two models is also discussed on the basis of the present investigation as well as other physical properties.
