A. Kling et al., LATTICE SITE DETERMINATION OF CR IN LOW DOPED LITHIUM-NIOBATE SINGLE-CRYSTALS USING PIXE CHANNELING/, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 138, 1998, pp. 426-430
The lattice sites of Cr have been determined in LiNbO3:Cr doped with 0
.1 mol% Cr3+ as well as in LiNbO3:Cr,Mg doped with 0.1 mol% Cr3+ and 6
.0 mol% MgO in melt, using PIXE/channeling, In the case of LiNbO3:Cr f
or the first time the occupation of both regular cation sites (60% on
Li sites and 40% on Nb sites) has been observed by channeling for a tr
ivalent impurity. For LiNbO3:Cr,Mg a significantly reduced fraction of
Cr (20%) is located on Li sites. The major fraction (80%) occupies an
interstitial site shifted 0.1 Angstrom from the regular Nb site towar
ds the center of the octahedron. (C) 1998 Elsevier Science B.V.