Electric field gradients at the ¹¹¹In and ^111mCd sites in undoped and Mg-doped LiNbO₃

B. Hauer, R. Vianden, J.G. Marques, N.P. Barradas, J.G. Correia, A.A. Melo, J.C. Soares, F. Agullo-Lopez and E. Dieguez

Physical Review B (Condensed Matter), USA * vol 51 (1 March 1995), no 10, p 6208-14, 32 refs.

Abstract:

The quadrupole interaction of ¹¹¹Cd in undoped (congruent) and Mg-doped LiNbO₃ has been studied using the pertubed angular correlation technique after impalntation of ¹¹¹In and ^111mCd. A stepwise annealing procedure shows the lattice to be fully reconstructed at 773 K. Our results show that both In and Cd are in the Li position. Mg doping at 6 mol % does not have any effect on the lattice location of these impurities in LiNbO₃.