Vibration and vibronic spectra of lanthanide compounds with different types of coordination polyhedra of tungsten and molybdenum.

Luminescence excitation vibronic spectra as well as IR and Raman spectra of about 50 primary, binary and ternary lanthanide tungstates and molybdates and compounds with mixed anions (doped by Eu3+ ions) relating to about 15 structural types were analysed. Correlation of the types of isolated and joint coordination polyhedra of tungsten or molybdenum with details of the vibration and Eu3+ vibronic spectra was investigated.