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Electric Auxetic Effect in Piezoelectrics.

Jian Liu1,2, Shi Liu3,4, Jia-Yue Yang1,2

  • 1Optics and Thermal Radiation Research Center, Shandong University, Qingdao, Shandong 266237, China.

Physical Review Letters
|November 20, 2020
PubMed
Summary
This summary is machine-generated.

Researchers discovered electric auxetic materials that contract or expand in all directions when exposed to an electric field. This novel piezoelectric response, analogous to the auxetic effect, was demonstrated in HfO2.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Auxetic materials exhibit a negative Poisson's ratio, expanding laterally under stress.
  • Piezoelectric materials change dimensions in response to an electric field.

Purpose of the Study:

  • Introduce the concept of the "electric auxetic effect" in piezoelectric materials.
  • Identify materials exhibiting this unusual response.
  • Investigate the underlying mechanisms of the electric auxetic effect.

Main Methods:

  • First-principles calculations to simulate material behavior.
  • Finite electric field calculations for screening.
  • Analysis of piezoelectric coefficients and internal strain contributions.

Main Results:

  • Ferroelectric HfO2 in the Pca21 orthorhombic phase exhibits negative longitudinal piezoelectric effect and electric auxetic behavior.
  • The negative longitudinal piezoelectric effect in HfO2 is driven by internal strain, similar to van der Waals solids.
  • Screening identified additional electric auxetic materials.

Conclusions:

  • The electric auxetic effect is a novel phenomenon in piezoelectric materials.
  • HfO2 is a promising material demonstrating this effect.
  • Further exploration of electric auxetic materials can lead to new technological applications.