Solvent Selective Effect Occurs in Iodinated Adamantanone Ferroelectrics.

Area of Science:

• Materials Science
• Organic Electronics
• Crystallography

Background:

• Organic ferroelectrics are typically solution-processed crystalline compounds.
• Solvent choice usually does not alter crystalline phases or physical properties.

Purpose of the Study:

• Investigate the solvent selective effect in iodinated adamantanone ferroelectrics.
• Explore the impact of solvent polarity on ferroelectric crystal phases and performance.

Main Methods:

• Synthesis of iodinated adamantanone ferroelectric crystals using different solvents (ethanol, ethyl acetate).
• Characterization of crystal phases and physical properties (SHG, piezoelectric coefficient, spontaneous polarization).
• Analysis of solvent polarity and interaction energies.

Main Results:

• Solvent polarity induces two distinct ferroelectric crystal phases: orthorhombic (from ethanol) and monoclinic (from ethyl acetate).
• The orthorhombic phase exhibits enhanced performance: stronger second harmonic generation (SHG), higher piezoelectric coefficient (d33 = 5 pC N⁻¹), and larger spontaneous polarization (Ps = 3.43 µC cm⁻²).
• Similar interaction energies between phases suggest facile solvent-induced transformation.

Conclusions:

• Solvent polarity is a critical factor in controlling organic ferroelectric crystal phases and optimizing their physical properties.
• This solvent-induced phase transformation offers a novel strategy for designing and enhancing organic ferroelectrics.
• The findings provide new insights into the chemical design and performance tuning of organic ferroelectric materials.