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The compositional ordering of Ag, Pb, Sb, Te ions in (AgSbTe₂)ₓ(PbTe)_2(1-x) systems possessing a NaCl structure is studied using a Coulomb lattice gas (CLG) model on a face-centered cubic (fcc) lattice and Monte Carlo simulations. Our results show different possible microstructural orderings. Ordered superlattice structures formed out of AgSbTe₂ layers separated by Pb₂Te₂ layers are observed for a large range of x values. For $x=0.5$, we see an array of tubular structures formed by AgSbTe₂ and Pb₂Te₂ blocks. For $x=1$, AgSbTe₂ has a body-centered tetragonal (bct) structure which is in agreement with previous Monte Carlo simulation results for restricted primitive model (RPM) at closed packed density. The phase diagram of this frustrated CLG system is discussed.
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Hoang et al. (2005) studied this question.
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