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Abstract
A detailed analysis of Raman, infrared and hyper-Raman spectra of PbHPO4 and PbDPO4 has led to new assignments for the lattice modes that have resolved previous conflicts. The soft mode is found to have A'(Bu ) symmetry. A peak near 230 cm−1 previously assigned to an A'(Bu ) lattice mode is shown to have line parameters that behave anomalously with temperature when compared to other A'(Ag ) and A'(Bu ) modes. This line may be second order in origin. All 7/4’ and 8A” symmetry lattice modes have now been identified.
