Abstract

Temperature dependence of electric field gradient (EFG) at Na site in NaD 3 (SeO 3 ) 2 was studied by the first order shift of quadrupole interaction. The principal coordinate system of EFG at one Na site of the two rotates with varing temperature in the ferroelectric phase. The splitting of resonance lines in the ferroelectric phase shows different behavior against temperature in different direction of the magnetic field. Spontaneous polarization P s was measured on a temperature range from just below the transition to -127°C both along the a and c * axes. Results indicate that P s rotates in the a c plane.

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