Lattice location and short range ordering of doping ions in RbTiOPO4

Carvajal, Joan J.; Ciatto, Gianluca; Peña, Alexandra; Pujol, Maria Cinta; Gavaldà, Josefina; Díaz, Francesc; Aguiló, Magdalena
February 2009
Applied Physics Letters;2/9/2009, Vol. 94 Issue 6, pN.PAG
Academic Journal
By using extended x-ray absorption fine structure spectroscopy, we demonstrate that Yb3+ ions in RbTiOPO4 and RbTi1-xNbxOPO4 crystals occupy titanium sites. By comparing these results with optical spectroscopic data and the structural location of Nb5+ codopants, we concluded that Yb3+ is located in Ti(2) positions in RbTi1-xNbxOPO4 crystals. Short range ordering between Yb3+ and Nb5+ rules electrical and optical properties of these nonlinear optical materials.


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