Comparison of the spectroscopic and crystallographic data of Tm3+ in the different hosts: KLn(MO4)2 where LnY,La,Lu and MMo,W

摘要: Abstract Raman scattering and polarised infrared spectra of the potassium rare-earth double molybdates tungstate (KLn x Tm 1− (MO 4 ) 2 , where LnLa,Y,Lu, MMo,W) were measured at ambient temperature in range 40–1000 cm −1 . The assignment observed bands to respective internal external vibrational modes is proposed. X-ray structural analysis yttrium thulium molybdate lanthanum crystals reported. crystal structure compounds studied depends on type cation changes from monoclinic (for lanthanum-thulium molybdate) orthorhombic yttrium- lutetium-thulium molybdates). character coordination sphere around molybdenum atom octahedral tetrahedral.