IMPURITY EFFECT ON N-14 NQR IN NA1-XAGXNO2 MIXED-CRYSTALS

The N-14 nuclear quadrupole resonance of the mixed crystals Na1-xAgxNO 2 for the range of 0 less than or equal to x less than or equal to 0.1 6 was measured at room temperature. The frequency shift of N-14 NQR li nes from the pure NaNO2 was not detected within experimental accuracy by introducing AgNO2 into NaNO2. However, an increase of the concentra tion of AgNO2 causes an increase of the line width and weakening of th e line intensity due to an increase in inhomogeneity of the electric f ield gradient (EFG) at the N-14 nucleus. From the probability that a N a+ ion is replaced by a Ag+ ion, characteristic volumes which measure the spatial range of influence of impurities on the EFG at the N-14 si te were determined. This volume contains up to the six nearest neighbo ur Na+ sites from the resonant nucleus. Copyright (C) 1996 Elsevier Sc ience Ltd