Lattice vibrations of AVO4 crystals (AÂ =Â Lu, Yb, Dy, Tb, Ce)

A short range force constant model has been applied using normal coordinates to investigate the Raman and the infrared wavenumbers in rare earth AVO4 compounds (A = Lu, Yb, Dy, Tb, Ce) having space group I41/a and symmetry C4h6. The calculated Raman and infrared wavenumbers are in very good agreement with the observed ones.