Dielectric Behaviour of the Ferroelectric AgNa(N02 )2 and Spin Lattice Relaxation of 23Na

The characteristic ferroelectric dispersion of the dielectric constant of A g N a ( N 0 2 ) 2 is measured near the ferroelectric phase transition. In accordance with other works an extremely slow relaxation is observed which can be related to a thermally activated motion of the electrical dipoles. The nuclear spin lattice relaxation time Tx of 23Na in A g N a ( N 0 2 ) 2 is measured by 90° — t—90° pulse sequences. In the entire temperature range the temperature dependence of Tx is governed by a thermally activated process which is ascribed to a diffusional motion. There is only a small influence of the dielectric instability on T1 .