Abstract
The 14 N nuclear quadrupole resonance (NQR) of Na 1-x Ag x NO 2 (x ≤ 0.16) and Na 1-x K x NO 2 (x ≤ 0.20) has been investigated at room temperature. The weakening of intensity and broadening of 14 N NQR lines with respect to the pure NaNO 2 were observed in both mixed crystals, whereas the frequency shift was not detected. From the intensity loss due to increased impurity concentration, the range of their influence on the electric field gradient (EFG) at the 14 N site was estimated to reach the fifth shell of neighbouring Na sites in both systems. However, the line broadening effect was found to be different for the two systems, being attributed to the difference in the electronegativity of Ag + and K + ions.
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