Dispersion of Dielectric Permittivity in a Nanocrystalline Cellulose-Triglycine Sulfate Composite at Low and Ultralow Frequencies

作者：Nguyen Hoai Thu'o'ng; Sidorkin A S^*; Milovidova S D

来源：Physics of the Solid State, 2018, 60(3): 559-565.

DOI：10.1134/S1063783418030320

The dispersion of dielectric permittivity in nanocrystalline cellulose-triglycine sulfate composites is studied in the range of frequencies from 10(-3) to 10(6) Hz, at temperatures varying from room temperature to the temperature of phase transition in this composite (54A degrees C), in weak electric fields (1 V cm(-1)). Two behaviors for the dielectric dispersion are identified in the studied frequency range: at ultralow frequencies (10(-3)-10 Hz), the dispersion is due to Maxwell-Wagner polarization, while at higher frequencies (10-10(6) Hz), the dispersion is due to the movement of domain walls in the embedded triglycine sulfate crystallites. An additional peak in the temperature-dependent profiles of dielectric permittivity is detected at lower temperatures in freshly prepared samples of the considered composite; we associate it with the presence of residual water in these samples.

• 出版日期2018-3