Micro-Raman investigation of KGd(WO4)(2) single crystals triply-doped with Pr3+/Tm3+/Yb3+, Ho3+/Tm3+/Yb3+ and Er3+/Tm3+/Yb3+ ions

作者：Kasprowicz D^*; Majchrowski A; Michalski E

来源：Journal of Alloys and Compounds, 2011, 509(22): 6354-6358.

DOI：10.1016/j.jallcom.2011.03.090

• Double tungstates
• KGd(WO4)(2)
• Rare earth ions
• Micro-Raman spectroscopy

The paper presents the first investigations of KGd(WO4)(2) single crystals triply- doped with Pr3+/Tm3+/Yb3+, Ho3+/Tm3+/Yb3+ and Er3+/Tm3+/Yb3+ ions by micro-Raman spectroscopy. No significant influence of doping ions on the Raman bands position was observed for investigated crystals at room temperature. The highest values of wavenumbers of Raman bands were observed for Pr3+/Tm3+/Yb3+ doped KGW crystals. The low-temperature dependences of the frequency of selected modes located at about 900, 807, 766, 746, 436, 348 and 342 cm(-1), assigned to the stretching and bending vibrations of WO42 tetrahedra and WOW and WOOW oxygen bridges, were analyzed in the 77-293K temperature range. Some anomalies in the spectral parameters of these modes are observed at about 145K for all investigated crystals. The results were discussed in terms of the local distortion of WO42- tetrahedra and deformation of WOW and WOOW oxygen bridge bonds vibrations in low-temperature range on the basis of the mismatch of the ionic radii of Pr3+, Er3+, Ho3+, Tm3+ and Yb3+ ions in the cationic layers.

• 出版日期2011-6-2