Video Experimental Relacionado
Updated: Jun 13, 2025
07:03
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
8.7K
Respuesta electromecánica ultra alta de las órdenes ferrónicas competidoras
Baichen Lin1,2, Khuong Phuong Ong3, Tiannan Yang4
1Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore, Republic of Singapore.
Nature
|September 11, 2024
Resumen
Los investigadores desarrollaron materiales de respuesta electromecánica ultraalta combinando órdenes antiferroeléctricas y ferroeléctricas competidoras. Este nuevo enfoque en películas delgadas de niobato de sodio logra altos coeficientes piezoeléctricos para dispositivos electromecánicos avanzados.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia condensada
- Química del estado sólido
Sus antecedentes:
- El acoplamiento electromecánico es vital para los transductores y dispositivos acústicos, que convierten la energía mecánica y eléctrica.
- Las respuestas electromecánicas altas están típicamente vinculadas a inestabilidades estructurales, logradas a través de límites de fase morfotrópicos o heterogeneidad a nanoescala.
Objetivo del estudio:
- Demostrar una nueva estrategia para lograr una respuesta electromecánica ultra alta.
- Inducir una extrema inestabilidad estructural mediante la explotación de órdenes antiferroeléctricas y ferroeléctricas competidoras.
Principales métodos:
- Guiado por diagramas de fase y cálculos teóricos.
- Coexistencia diseñada de fases ortorrómbicas y romboédricas antiferroeléctricas en películas delgadas de niobato de sodio.
Principales resultados:
- Se han logrado coeficientes piezoeléctricos efectivos superiores a 5000 pm/V.
- Se observó una respuesta electromecánica ultraalta debido a las transiciones de fase antiferroeléctrica-ferroeléctrica inducidas por el campo eléctrico.
Conclusiones:
- El estudio presenta un enfoque general para el diseño y la utilización de materiales antiferroeléctricos.
- Este método permite la creación de materiales con respuesta electromecánica ultra alta para dispositivos electromecánicos.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:31Ferromagnetism
2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
01:28Types Of Superconductors
954
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
954
02:58Crystal Field Theory - Octahedral Complexes
26.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.2K
01:22Motional Emf
3.2K
Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
3.2K
02:54Trends in Lattice Energy: Ion Size and Charge
23.8K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.8K