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Lattice dynamics for several ordered supercells with compositionPbMg1/3Nb2/3O (PMN) were calculated with first-principles frozen phononmethods. Nominal symmetries of the supercells studied are reduced by latticeinstabilities. Lattice modes corresponding to these instabilities, equilibriumionic positions, and infrared (IR) reflectivity spectra are reported.Comment: 6 pages; Fundamental physics of Ferroelectrics 200

First Principles Calculations of Ionic Vibrational Frequencies in PbMg1/3Nb2/3O3