Abstract
In the present paper the dielectric investigation results of NaNO 2 and NaNO 3 confined in porous glass are presented. The phase transition in nanoconfined NaNO 2 with pore size 20 nm remains nearly at the same temperature. Two phase transitions can be seen in the dielectric spectra. The increase in the frequency dependent dielectric permittivity on heating is mainly the result of a conductivity effects. The relaxational soft mode contribution is present as well but is small as compared to the conductivity contribution. Such huge conductivity is caused by a premelting phase, which is visible even at temperatures below the phase transition. Relaxational soft mode temperature behaviour is also different from classical ferroelectrics. Only change in the activation energy can be identified as a phase transition. Due to that contribution of this mode, the static dielectric permittivity also behaves completely different—it has minima at T C . Present results confirmed value of T C obtained from neutron scattering experiments. Obtained results are compared between NaNO 3 and NaNO 2 .
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