Abstract
The solid solution behavior and second-harmonic generating (SHG) properties of SbSbxM1−xO4 (M=NbV or TaV) (x=0.0, 0.2, 0.4, 0.5, 0.6, 0.8, and 1.0) have been investigated by powder X-ray diffraction and nonlinear optical (NLO) measurements. Both SbNbO4 and SbTaO4 form solid solutions with α-Sb2O4. All the materials crystallize in the non-centrosymmetric space group Pna21, with SbIIIO4E polyhedra linked to MVO6 (MV=SbV, NbV, or TaV) octahedra. SHG data is presented for the solid solutions and α-Sb2O4, SbNbO4, and SbTaO4. With respect to the SbSbxM1−xO4 phases, NLO measurements indicate a substantial decrease in SHG efficiency for x≥0.6. This decrease is attributable to the “nonpolar” nature of the SbVO6 octahedra compared with the polar nature of NbVO6 or TaVO6.
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