Abstract
Nuclear quadrupole resonance has been studied in ferroelectric sodium nitrite (NaNO 2 ) from 77 K to its phase transition point 437 K. The three rotational frequencies ω a =190 cm -1 , ω b =120 cm -1 and ω c =227 cm -1 and their temperature variation when fitted in the Bayer-Kushida theory predict the temperature dependence of nqr frequencies reasonably well. A second order phase transition is found to occur at 180 K which is in confirmity with the one found earlier from thermal expansion and dielectric studies. The shift in resonance frequencies is seen to occur mainly by rotation around the ` c ' axis and hence it is inferred that the mechanism of polarization reversal is intimately connected with orientational motion about ` c ' axis.
Published Version
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