Order–disorder phenomena in binary alloy thin films

Layer dependent composition of AuCu3(100) in the semi-infinite and thin film geometry

“…The relative number of the sites α is F α and that of sites β 1 is F β1 , thus F α + F β1 = 1. In this manner, for each odd layer i there are four site probabilities p α A (i), p β1 A (i), p α B (i) and p β1 B (i) which should be taken into account [2]. These probabilities are normalised by:…”

“…The entropy term of the free energy F given by (4.9) can be calculated in the usual way [2] taking into account that:…”

“…Denoting by V ii CC and V ii±1 CC the energies which describe the interaction between two atoms C and C in the sense of the Bragg-Williams approximation [2] when C and C lie in one monoatomic layer i or in two neighbouring monoatomic layers i and i , respectively, we can write the internal energy term U in the form:…”

“…The aim of the present paper is to analyze the experimental data [1] and to compare their behavior with the conclusions based on the theoretical interpretation which reflects the influence of the alloy structure on the surface properties [2].…”

The Possibility of New Ordering Reaction in Cu-50 mass% Au Alloy

“…Since its observation on 1934 2) in Cu-Zn alloys (brass), this transition which is expressed by the existence of one state in which atoms are ordered in crystal lattice, has been widely studied. [3][4][5][6][7] On the basis of X-ray diffraction, it has been noticed that below certain transition temperature, the atoms can be ordered on two sublattices which interpenetrate, i.e. the atoms of every type have tendency to take specific places in the crystal lattice by changing their position.…”