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In previous work, molecular dynamics simulations based on afirst-principles-derived effective Hamiltonian for$Pb_{1-X}(Sc_{1/2}Nb_{1/2})O_{3-X}$~ (PSN), with nearest-neighbor Pb-Odivacancy pairs, was used to calculate $X_{\rm [Pb-O]}$~vs.~T, phase diagramsfor PSN with: ideal rock-salt type chemical order; nanoscale chemicalshort-range order; and random chemical disorder. Here, we show that the phasediagrams should include additional regions in which a glassy relaxor-phase (orstate) is predicted. With respect to phase diagram topology, these resultsstrongly support the analogy between relaxors and magnetic spin-glass-systems.

The Polar Nano Regions $\rightleftharpoons$ Relaxor Transition in  $Pb_{1-X}(Sc_{1/2}Nb_{1/2})O_{3-X}$; $X$ = bulk concentration of nearest  neighbor [Pb-O] divacancies