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The properties of NaNO2 in the restricted geometry were studied by nonlinear dielectric spectroscopy. It is shown that for silicate matrices MCM-41 filled with NaNO2, reducing the pore size leads to an increase in the nonlinearity and the change in the shape of the temperature dependence of the amplitude of the third harmonic.
Measurements of the linear permittivity and third-order harmonic generation were carried out for KNO 3 loaded molecular sieves MCM-41 with pores of 37 and 26Å in comparison with bulk potassium nitrate. The samples were warmed up to 423 and 463K from room temperature. The ferroelectric phase III was shown to occur upon cooling in both nanocomposites after warming till 463K when it emerges also...
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