抄録
Thin films of Au3Cu were prepared by the evaporation method and an imperfect, but sufficient order was formed in them after annealing at about 200°C for 100∼200 hrs. The films, whose transmissionp hotographs showed clear superlattice rings, were heated step by step up to 400°C or 500°C, and the collapsing manner of order was observed by gradual transition of difuse superlattice rings to broad and faint bands, which persisted even at far higher temperatures than the transition point. our resalts coincided well with those of Germer and others in Cu3Au, and these electron diffraction studies supported the results obtained by the specific heat measurements on the behaviour of Cu3Au, Au3Cu and CuAu at higher temperatures.
