Effect of counter anions on ferroelectric properties of diisopropylammonium-cation based molecular crystals

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Abstract

Diisopropylammonium cation based single crystals with different counter anions (F, Cl, Br, I, NO-3, and CIO-4) were prepared. Their crystal structures and ferroelectric properties were investigated by single-crystal X-ray diffraction spectroscopy, differential scanning calorimetry, and dielectric measurements. The experimental results illustrate that the ferroelectric properties of diisopropylammonium-based single crystals are closely related to the electronegativity and structure of the counter anions. For monoatomic anions, higher electronegativity results in higher polarization and phase-transition temperature of the corresponding molecular–ionic ferroelectrics. The results of density-functional theory (DFT) calculations also support the experimental results.

Original languageEnglish
Article numbere201700029
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume214
Issue number6
DOIs
StatePublished - 1 Jun 2017

Keywords

  • density-functional theory calculation
  • diisopropylamine
  • molecular ferroelectrics
  • polarization

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