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Related Concept Videos

Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Related Experiment Video

Updated: Jul 16, 2026

Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
07:44

Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy

Published on: April 27, 2016

Topological piezoelectricity in bulk ferroelectrics.

Zheng Wu1, Yating Ran2,3, Yuanbo Li4

  • 1Key Laboratory of Optoelectronic Material and Device, Department of Physics, Shanghai Normal University, Shanghai, China.

Nature Materials
|July 14, 2026
PubMed
Summary

Researchers discovered topological vortex domains in bulk ferroelectrics, enhancing piezoelectric properties. A new method significantly boosted vortex density, improving material performance for advanced electronics.

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Last Updated: Jul 16, 2026

Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Ferroelectricity

Background:

  • Ferroelectric topological vortex domains offer unique properties for electronics.
  • Research has primarily focused on low-dimensional systems, leaving bulk ferroelectric vortex behavior underexplored.

Purpose of the Study:

  • To identify and characterize topological vortex structures in bulk ferroelectrics.
  • To elucidate the role of these vortex domains in enhancing macroscopic piezoelectric response.
  • To develop a scalable method for engineering vortex domain density.

Main Methods:

  • Identification of topological vortex structures in bulk Pb(Mg1/3Nb2/3)O3-PbTiO3 crystals.
  • Development of mechanically assisted electrical poling for domain engineering.
  • Quantification of vortex core density before and after poling.

Main Results:

  • Topological vortex structures were identified in bulk ferroelectric crystals.
  • Mechanically assisted electrical poling increased vortex core density from 0.01 μm⁻² to 21 μm⁻².
  • Enhanced vortex density directly correlated with a significant improvement in piezoelectric response.

Conclusions:

  • A mechanistic link between bulk vortex structures and enhanced piezoelectric performance was established.
  • The study provides a practical pathway for engineering high-performance ferroelectric materials.
  • Findings pave the way for advanced electronic device applications utilizing bulk ferroelectrics.