Gold-palladium alloys, ranging around AuPd 3 in composition, were studied by electron diffraction using evaporated single crystal films, and a superlattice AuPd 3 was found. The temperature of order-disorder transformation was estimated at about 780°C for the alloy with a composition of about 80 at. % palladium. The electron diffraction pattern of the ordered alloy AuPd 3 showed that the intensities of the superlattice reflections were extremely weak, though they were sharp. The results mean that the degree of order is of a very reduced value. This special nature of the ordered alloy AuPd 3 is discussed by comparing to other ordered alloys of the noble metal-palladium systems.
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Matsuo et al. (1966) studied this question.
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