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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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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Induced Electric Fields01:23

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Updated: Jan 13, 2026

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Efecto Flexo-Piroeléctrico

Weihao Gao1,2, Shuhai Liu1,2, Yong Qin1,2

  • 1Institute of Nanoscience and Nanotechnology, School of Materials and Energy, Lanzhou University, Lanzhou, Gansu 730000, China.

Research (Washington, D.C.)
|January 8, 2026
PubMed
Resumen

Los científicos indujeron piroelectricidad en materiales centosimétricos utilizando el efecto flexoeléctrico. Este efecto flexo-piroeléctrico supera las limitaciones de simetría, permitiendo nuevas tecnologías sostenibles de recolección de energía.

Palabras clave:
efecto flexo-piroeléctricopiroelectricidadmateriales centosimétricosrecogida de energíaingeniería de deformaciónefecto flexoeléctricoSrTiO3

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Área de la Ciencia:

  • Ciencia de Materiales
  • Recolección de Energía
  • Física del Estado Sólido

Sus antecedentes:

  • Las tecnologías de energía sostenible son cruciales para abordar los desafíos globales.
  • Los materiales piroeléctricos convierten las fluctuaciones de temperatura en electricidad, ofreciendo una ruta prometedora para la recolección de energía.
  • La piroelectricidad convencional se limita a cristales no centosimétricos, excluyendo muchos materiales con propiedades favorables.

Objetivo del estudio:

  • Superar la restricción de simetría en materiales piroeléctricos.
  • Demostrar la inducción de piroelectricidad en materiales centosimétricos.
  • Explorar el potencial del efecto flexoeléctrico para la recolección de energía.

Principales métodos:

  • Se utilizó el efecto flexoeléctrico para inducir piroelectricidad.
  • Se introdujeron gradientes de deformación utilizando un microscopio de fuerza atómica.
  • Se investigaron las propiedades piroeléctricas en el material centosimétrico SrTiO3.

Principales resultados:

  • Se logró un coeficiente piroeléctrico gigante de hasta 1.25 × 10^6 μC·m^-2·K^-1 en SrTiO3.
  • Se demostró el efecto flexo-piroeléctrico, que permite la piroelectricidad en materiales centosimétricos.
  • Se desacopló la funcionalidad piroeléctrica de la polaridad intrínseca del material a través de la ingeniería de deformación.

Conclusiones:

  • El efecto flexo-piroeléctrico supera la limitación de simetría de larga data en la piroelectricidad.
  • Los materiales centosimétricos pueden exhibir una piroelectricidad robusta a través de la ingeniería de deformación.
  • Este descubrimiento abre una vasta biblioteca de materiales para los recolectores de energía de próxima generación y avanza la tecnología sostenible.