On the local motions in ferroelectric NaNO2 from 23Na NMR data

Electric field gradients (efg) at the sites of sodium in the ferroelectric NaNO2 are calculated for various local motions. It is found that the values of efg obtained from 23Na NMR data are best represented when the NO2 groups are considered to be executing flipping motion by 170° about an axis whose direction cosines are 0.99, 0.11, 0.06 with respect to the crystal axes (c, a, b). Such a motion is in conformation with the not-so-widely known fact that the electric polarization in ferroelectric NaNO2 has a spiraling orientation as one moves from one domain to the other.

Keywords:

• NaNO₂
• EFG
• NMR of Ferroelectric NaNO₂
• Ferroelectric Domain
• M- Tensor AIP's PACS Codes: 77.80 Dj; 76.60 Es; 77.80 Gv; 33.25 +k; 77.84 Bw