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<p>A novel composite based on an organic ferroelectric of diisopropylammonium iodide combined with different concentrations of 2, 5 and 10 wt% of copper particles in size of 1&#xa0;μm was developed and investigated for its ferroelectricity. Pure diisopropylammonium iodide was also synthesized and measured under the same conditions for comparison. Materials were characterized by Scanning Electron Microscopy, Energy-Dispersive Spectroscopy and Fourier-transform infrared spectroscopy techniques. The ferroelectricity was tested by analyzing the temperature dependencies of dielectric permittivity, the third harmonic coefficient and differential thermal analysis from 300&#xa0;to&#xa0;400&#xa0;K. It was revealed that the sequence of phase transitions in ferroelectric parts was changed in comparison with those in the pure diisopropylammonium iodide. Besides, an enhancement of Curie point was also detected. The obtained anomalies are discussed using Landau phenomenological theory considering the interaction of ferroelectric parts with copper particles, interphase boundaries and shielding fields.</p> Graphic Abstract <p></p>

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Anomalous ferroelectricity of a novel composite based on an organic ferroelectric of diisopropylammonium iodide filled with copper microparticles: Experimental and theoretical approaches

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Hoai Thuong Nguyen,
  • A. Yu. Milinsky,
  • S. V. Baryshnikov

摘要

A novel composite based on an organic ferroelectric of diisopropylammonium iodide combined with different concentrations of 2, 5 and 10 wt% of copper particles in size of 1 μm was developed and investigated for its ferroelectricity. Pure diisopropylammonium iodide was also synthesized and measured under the same conditions for comparison. Materials were characterized by Scanning Electron Microscopy, Energy-Dispersive Spectroscopy and Fourier-transform infrared spectroscopy techniques. The ferroelectricity was tested by analyzing the temperature dependencies of dielectric permittivity, the third harmonic coefficient and differential thermal analysis from 300 to 400 K. It was revealed that the sequence of phase transitions in ferroelectric parts was changed in comparison with those in the pure diisopropylammonium iodide. Besides, an enhancement of Curie point was also detected. The obtained anomalies are discussed using Landau phenomenological theory considering the interaction of ferroelectric parts with copper particles, interphase boundaries and shielding fields.

Graphic Abstract