N NQR Studies of Impurity Effects on the Local Structure of NaN02-based Mixed Systems

The influence of impurities on the N NQR lineshape of Na1_^AgcN02 and [NaN02],_,[BN03]^ (B = Na, K) at room temperature has been investigated. Carrying out spectral analysis in conjunction with classification of the local field inhomogeneities according to the structurally isomorphic, Na]_xAgxN02, and anisomorphic [NaNO^.JBNC^b systems, enabled an understanding of the microscopic nature of impurity-induced local disorder. The isoand anisomorphic systems reveal their own unique features of the impurity induced local disorder. They are characterized by a static, random distribution of impurities in the isomorphic system and a fast motion of the impurity-induced mobile point defects in the anisomorphic system. However, for both systems, neither a change of the 14 N NQR frequency nor a multisplitting of the lines is observed because of the relatively low symmetry.