Dielectric properties of ferroelectric nanocomposites of nanocrystalline cellulose and sodium nitrite
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A novel nanocomposite consisting of nanocrystalline cellulose (NCC) and sodium nitrite (NaNO2) was synthesized and its dielectric properties were investigated at the temperature range of 20–170 °C and at the frequency range of 10−3–106 Hz under low electric fields (1 V cm−1). The obtained results manifest a reduction in the phase transition temperature of the synthesized composite (110 °C) compared to those of bulk NaNO2 (164 °C) due to the tilting action of the depolarizing field on the polarization for NaNO2 inclusions resulting from the presence of the bound charges on their surfaces. In addition, a significant dispersion of dielectric permittivity was detected and the explanation for this was based on the Maxwell–Wagner–Sillars relaxation mechanism.
KeywordsFerroelectric nanocomposites Cellulose Sodium nitrite Phase transition Relaxation
The study was supported by the Russian Science Foundation, Project no. 17-72-20105.
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