Structural and vibrational properties of microcrystalline TlM(MoO4)2 (M=Nd, Pr) molybdates

Electrical and Vibrational Studies of Na2K2Cu(MoO4)3

“…This is in agreement with the centrosymmetric character of Na 2 K 2 Cu(MoO 4 ) 3 structure [36]. The Raman spectrum can be separated into two parts with a wide empty gap in the range 500-700 cm −1 that is commonly observed in molybdates containing MoO 4 tetrahedra [22,[37][38][39][40][41][42][43]. The proposed assignment of the vibrational spectra of MoO 4 in Na 2 K 2 Cu(MoO 4 ) 3 is realised by considering the following criteria: ] 1 bands are generally very strong in the Raman and weaker in the infrared spectra, whereas an opposite behavior is usually observed for ] 3 bands. ]…”

Upconversion photoluminescence properties of SrY2(MoO4)4:Er3+/Yb3+ phosphors synthesized by a cyclic microwave-modified sol–gel method

“…The Raman spectra of SrY 1.8 (MoO 4 ) 4 :-Er 0.2 , SrY 1.7 (MoO 4 ) 4 :Er 0.1 Yb 0.2 and SrY 1.5 (MoO 4 ) 4 :Er 0.05 Yb 0.45 particles proved that the doping ions of Er 3+ /Yb 3+ can influence the structure of the host materials. The combination of a heavy metal cation and the large inter-ionic distance for Er 3+ and Yb 3+ substitutions in Y 3+ sites in the lattice result in a high probability of UC and the phonon-splitting relaxation in SrY 2 (MoO 4 ) 4 crystals.It may be that these very strong and strange effects are generated by the disorder of the [MoO 4 ] 2À groups with the incorporation of the Er 3+ and Yb 3+ elements into the crystal lattice or by a new phase formation[32][33][34].…”

Cyclic MAM synthesis and upconversion photoluminescence properties of CaMoO4:Er3+/Yb3+ particles

“…The Raman spectra of the (b) CaMoO 4 :Er 3+ (CMO:Er), (c) CaMoO 4 :Er 3+ /Yb 3+ (CMO:Er/ Yb), (d) CaMoO 4 :Er 3+ /Yb 3+ # (CMO:Er/Yb#) and (e) CaMoO 4 :Er 3+ / Yb 3+ ## (CMO:Er/Yb##) particles indicate additional strong peaks at both higher frequencies (618, 575, 492, 420 and 373 cm À1 ) and lower frequencies (290 and 234 cm À1 ). Atuchin et al[29][30][31] could consider that the very strong and strange effect in the Ln-doped crystalline samples may be generated by the disorder of the MoO 4 groups with the incorporation of the Ln element into the crystal lattice or by a new phase formation. The Raman spectra of CaMoO 4 :Er 3+ , CaMoO 4 :Er 3+ /Yb 3+ , CaMoO 4 :Er 3+ /Yb 3+ # and CaMoO 4 :Er 3+ /Yb 3+ ## particles proved that the doping ions can influence the structure of the host materials.…”