SHG Assisted Mixed-Phases Anatomizing in a Molecular Ferroelectric

Area of Science:

• Materials Science
• Solid-State Physics
• Chemistry

Background:

• Understanding mixed-phase materials is crucial for their practical applications.
• Molecular ferroelectrics present unique challenges and opportunities in phase behavior.
• Diisopropylammonium chloride (DIPACl) serves as a model system for studying monoaxial molecular ferroelectrics.

Purpose of the Study:

• To elucidate the contributions and distributions of two competing symmetric phases in DIPACl.
• To investigate the switching behavior between these phases under external stimuli.
• To establish DIPACl as a model for phase engineering in molecular ferroelectrics.

Main Methods:

• Utilized second-harmonic generation (SHG) polarimetry to analyze phase contributions.
• Employed piezoresponse force microscopy (PFM) to map phase distributions.
• Investigated phase switching induced by external electrical fields.

Main Results:

• Successfully analyzed the mixing profiles and quantified phase proportions in DIPACl.
• Demonstrated electrical field-induced switching between thermodynamically and kinetically preferred phases.
• Provided evidence for distinct phase behaviors under electrical versus thermal stimuli.

Conclusions:

• This research offers novel insights into phase engineering strategies for molecular ferroelectrics.
• The applied techniques serve as potent analytical tools for future mixed-phase material studies.
• The findings contribute to the fundamental understanding of phase coexistence and switching in ferroelectric materials.