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A Novel Composite from Nanodispersed Silica and an Organic Ferroelectric of Diisopropylammonium Bromide: Preparation, Characterization and Dielectric Properties


Bich Dung Mai, Hoai Thuong Nguyen, Duc-Quang Hoang

Source title: 
Materials Transactions, 60(10): 2132-2136, 2019 (ISI)
Academic year of acceptance: 

A novel composite consisting of silica nanoparticles (SiO2) and a typical organic ferroelectric of diisopropylammonium bromide (C6H16NBr, DIPAB) was prepared at different composition mass ratios. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques were utilized for characterization of the composite. Experiments for testing ferroelectricity was conducted from room temperature to 165°C under a weak electric field (5 V·cm−1) at a low frequency of 1 kHz. The results revealed a reduction of phase transition temperature with increasing SiO2 content. The Landau theories developed for bonded and isolated ferroelectric particles were used to explain the obtained anomalies.


Phase transition in SiO2+DIPAB composite.