Video Experimental Relacionado
Updated: Jun 21, 2026
10:36
Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
El control del dopaje de F en los superconductores pnictide de alta temperatura
Gianluca A Artioli1, Lorenzo Malavasi, M Cristina Mozzati
1Department of Physical Chemistry M. Rolla, INSTM and IENI/CNR, University of Pavia, Pavia, Italy.
Journal of the American Chemical Society
|August 12, 2009
Resumen
La pérdida de flúor (F) es crítica en los superconductores de óxido de pnictide, lo que afecta sus propiedades. Este estudio proporciona evidencia directa de la pérdida de F durante la síntesis estándar, destacando la necesidad de controlar el contenido de F.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química del estado sólido.
- La superconductividad es la superconductividad.
Sus antecedentes:
- Los superconductores de óxido de pnictide son un área clave de la investigación de materiales.
- El control de la composición elemental es crucial para optimizar las propiedades de los superconductores.
- El papel del flúor en estos materiales no se entiende completamente.
Objetivo del estudio:
- Para investigar la importancia del contenido de flúor en los superconductores de óxido de pnictide.
- Para proporcionar evidencia directa de la pérdida de flúor durante la síntesis de materiales.
- Para enfatizar la importancia del control del flúor en la fabricación de superconductores.
Principales métodos:
- Síntesis de muestras de superconductores de óxido de pnictide utilizando métodos de rutina.
- Caracterización de muestras para evaluar la composición elemental.
- Detección directa y cuantificación de la pérdida de fluor.
Principales resultados:
- Demostró un papel relevante para el contenido de flúor en los superconductores de óxido de pnictide.
- Proporcionó evidencia experimental directa de pérdida de flúor en muestras sintetizadas.
- Indicó que los procedimientos sintéticos estándar pueden conducir a una deficiencia significativa de flúor.
Conclusiones:
- El control de la pérdida de flúor es esencial para la síntesis reproducible de superconductores de óxido de pnictide.
- Los métodos sintéticos de rutina pueden comprometer inadvertidamente las propiedades superconductoras debido a la pérdida de flúor.
- Se justifica una mayor investigación sobre la incorporación y retención de flúor.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:22Biasing of FET
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
01:28Types Of Superconductors
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...
01:24Superconductor
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
01:29Field Effect Transistor
Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
01:18Fermi Level
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...