The present work is devoted to comparative study on electrophysical properties of non-irradiated and gamma-irradiated ferroelectric composites synthesized from triglycine sulfate and cellulose nanoparticles. The investigation of phase transition indicated that depending on composition weight ratio, the phase transition temperature of non-irradiated samples increased by 3 to a few tens of celcius degrees higher than those for single crystal TGS (+49°C), while the characteristic relaxation frequencies were lower. Besides, two areas of linear dispersion and Debye-like relaxation were detected in the studied frequency range. Under the influence of gamma irradiation, the phase transition temperature and characteristic relaxation frequencies decreased as compared to those of the non-irradiated samples. The stated anomalies can be explained by the interaction between cellulose nanoparticles and triglycine sulfate inclusion through hydrogen bonds, and by the defects created by gamma irradiation.

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The present work is devoted to clarifying the influence of silica nanoparticles on dielectric relaxation frequencies of a classical ferroelectric – triglycine sulfate at low frequencies (102 – 107 Hz) from 20 ˚C to phase transition point for composite samples prepared at different composition weight ratios. Theresults indicated the reduction of relaxation frequency with increasing the silica content due to the intensified interaction between nanoparticles and tryglycine sulfate inclusion. The nature of this interaction was thoroughly discussed in this study.

The aim of this work is to clarify dielectric relaxation phenomena in paraelectric phase of composites based on nanocrystalline cellulose and triglycine sulfate. Although the dielectric properties of this material were almost thoroughly investigated, but there has been no study devoted to relaxation anomalies in paraelectric phase. The results showed the presence of Debye-like relaxation at the entire studied frequency range 103 – 106 Hz under a weak electric field of 1 V.m-1 from phase transition temperature in the composite (54 ˚C) to 90 ˚C. In addition, the phenomena were observed at lower frequencies as compared to those of triglycine sulfate single crystals. The results were explained by the assumption based on critical slowing down occurred in the nanoparticles in the composite.