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Effects of composition ratio on structure and phase transition of ferroelectric nanocomposites from silicon dioxide nanoparticles and triglycine sulfate


Bich Dung Mai, Hoai Thuong Nguyen, Thi Kim Anh Nguyen, Dinh Hien Ta and Thi Nhan Luu

Source title: 
Phase Transitions, 92(6), 2019 (ISI)
Academic year of acceptance: 

The present work is devoted to study on influences of silicon dioxide nanoparticles (SiO2) on structure and phase transition of a classical ferroelectric of triglycine sulfate (TGS) by synthesizing a composite containing SiO2 and TGS at different composition weight ratios. Particle size analysis, X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) techniques were utilized to charaterize the synthesized composite. The experiments for investigation of phase transition were conducted from 20 to 120oC under a weak electric field (1 V.cm−1) at 1 kHz. The results revealed an expansion of ferroelectric phase of TGS by 15–55oC with increasing the SiO2 content. Besides, an additional phase transition point which is characteristic for the bulk clusters of TGS was found at low content of SiO2. The detected anomalies were discussed thoroughly based on the interaction between components in the composite.