Video Experimental Relacionado
Updated: Jun 29, 2026
09:05
Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
Published on: May 15, 2015
Superconductividad a 39 K en el diboruro de magnesio
J Nagamatsu1, N Nakagawa, T Muranaka
1Department of Physics, Aoyama-Gakuin University, Tokyo, Japan.
Nature
|March 10, 2001
Resumen
Los investigadores descubrieron la superconductividad a granel en el diboruro de magnesio (MgB2) a 39 K. Este nuevo récord de alta temperatura de transición (Tc) para materiales que no son óxido de cobre abre caminos para futuras investigaciones de superconductores.
Área de la Ciencia:
- Física de la materia condensada Física de la materia condensada
- Ciencia de los materiales Ciencia de los materiales.
- La superconductividad es la superconductividad.
Sus antecedentes:
- Se han hecho avances significativos en los superconductores de óxido de cobre, lo que ha llevado a la exploración de otras clases de materiales.
- Los superconductores masivos existentes que no son de óxido de cobre tienen temperaturas de transición (Tc) por debajo de 35 K, como Cs(x) Rb(y) C60 (33 K) y Ba(1-x) K(x) BiO3 (30 K).
- La superconductividad superficial en el C60 dopado con agujero ha alcanzado los 52 K, pero las propiedades de la masa continúan siendo un área de investigación clave.
Objetivo del estudio:
- Investigar la posibilidad de temperaturas de transición más altas (Tc) en materiales a granel que no sean óxido de cobre.
- Para informar sobre el descubrimiento de la superconductividad a granel en un nuevo sistema de materiales.
Principales métodos:
- Síntesis y caracterización del diboruro de magnesio (MgB2).
- Medición de la resistividad eléctrica.
- Mediciones de susceptibilidad magnética para confirmar la superconductividad a granel.
Principales resultados:
- Descubrimiento de la superconductividad a granel en el diboruro de magnesio (MgB2).
- Determinación de una temperatura de transición (Tc) de 39 K.
- Este Tc representa el valor más alto reportado hasta la fecha para un superconductor a granel sin óxido de cobre.
Conclusiones:
- El diboruro de magnesio (MgB2) exhibe superconductividad a granel a una velocidad sin precedentes de 39 K.
- Este hallazgo establece al MgB2 como el principal superconductor de masas sin óxido de cobre.
- El descubrimiento fomenta una mayor investigación sobre MgB2 y compuestos relacionados para aplicaciones de alto Tc.
Más Videos Relacionados
10:57Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
11:38In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
Published on: February 1, 2020
Videos de Conceptos Relacionados
03:06Alkali Metals
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
02:39Phase Transitions: Melting and Freezing
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
03:20Nuclear Transmutation
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...
01:04¹³C NMR: ¹H–¹³C Decoupling
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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...
01:18Supercritical Fluid Chromatography
Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...
SFC utilizes a supercritical fluid mobile phase,...