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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Local Strain and Polarization Mapping in Ferrielectric Materials.

Sabine M Neumayer1, John A Brehm2, Lei Tao2,3

  • 1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, 37831 Tennessee, United States.

ACS Applied Materials & Interfaces
|August 19, 2020
PubMed
Summary

This study reveals that copper indium phosphorus sulfide (CuInP2S6) exhibits unique stress-dependent piezoelectric properties. Researchers used theory and experiments to map strain and stress distributions in ferroelectric domains.

Keywords:
copper indium thiophosphatepiezoelectric constantpiezoresponse force microscopystress mappingvan der Waals materials

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Copper indium phosphorus sulfide (CuInP2S6) is a van der Waals material known for unusual properties.
  • Previous studies identified CIPS as a uniaxial quadruple-well ferrielectric with strain-controlled polarization states.

Purpose of the Study:

  • To investigate the unexplored stress-dependent piezoelectric properties of CuInP2S6.
  • To correlate mechanical and electromechanical characteristics for nanoscale imaging.

Main Methods:

  • Combined density functional theory (DFT) calculations and piezoresponse force microscopy (PFM).
  • Analyzed stress-induced changes in piezoelectric constants for different polarization phases.
  • Interpreted ferroelectric domain images to reveal local strain and stress distributions.

Main Results:

  • Predicted differences in mechanical properties and piezoelectric stress sensitivity between the two polar phases.
  • Confirmed the presence of only the low-polarization phase in the studied sample.
  • Observed strained domains with one polarization orientation and relaxed domains with the opposite orientation.

Conclusions:

  • The interplay of DFT and PFM provides nanoscale insights into structural, mechanical, and electromechanical properties.
  • The developed imaging methodology is applicable to various materials with known electromechanical-mechanical relationships.
  • Understanding stress-strain-piezoelectric coupling is crucial for advanced materials characterization.