Abstract
Zone-centre Raman and infrared phonon frequencies for lithium manganese oxides LixMn2O4 (x=1, 0.5 and 0.015) have been calculated using a proposed six parameter bond-bending force constant model. The significant outcome of the present work is that the tetrahedral force constants are smaller than the octahedral ones. The zone-centre phonon frequencies, thus calculated using these parameters, are found to be in a good agreement with the experimental results.
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