Temperature induced phase transformations on the Li2MoO4 system studied by Raman spectroscopy

The present research reports results of lattice dynamics calculations and temperature-dependent Raman scattering study of the dilithium molybdate. Calorimetric measurements up to 1000 °C corroborated that the crystal structure experienced gradual modifications, characterized by changes in the DSC base line. These stated thermal events as well as the changes in the profile of the Raman spectra, suggested that a phase transformation is connected with tilting and/or rotations of the MoO4 tetrahedron leading to a disorder in the MoO4 sites.114