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Corrientes críticas altas en cables MgB2 superconductores revestidos de hierro
1Agere Systems/Lucent Technologies, Murray Hill, New Jersey 07974, USA. jin@agere.com
Nature
|June 1, 2001
Resumen
Los investigadores desarrollaron un nuevo método para crear alambres superconductores de diboruro de magnesio (MgB2) densos y revestidos de metal. Estos cables demuestran altas densidades críticas de corriente, allanando el camino para aplicaciones prácticas de superconductores a granel.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Física de la materia condensada Física de la materia condensada
- La superconductividad es la superconductividad.
Sus antecedentes:
- Los superconductores a granel requieren altas densidades críticas de corriente (Jc) y un revestimiento metálico protector.
- El diboruro de magnesio (MgB2) exhibe superconductividad a 39 K, ofreciendo potencial para aplicaciones a granel.
- Fabricar MgB2 en cables prácticos es un desafío debido a su fragilidad y dificultades de síntesis.
Objetivo del estudio:
- Desarrollar un método para fabricar alambres superconductores MgB2 densos y revestidos de metal.
- Para demostrar la densidad de corriente crítica de transporte (Jc) de estos alambres fabricados.
- Para investigar el efecto de los materiales de revestimiento en la superconductividad de MgB2.
Principales métodos:
- Fabricación a presión ambiente de alambres MgB2 revestidos de hierro.
- Síntesis de MgB2 denso con una pérdida mínima de estequiometría.
- Medición de la densidad de corriente crítica de transporte (Jc) en 4.2 K.
Principales resultados:
- Fabricó con éxito alambres superconductores MgB2 densos y revestidos de metal.
- Se logró un transporte Jc superior a 85.000 A cm-2 a 4,2 K. Se logró un transporte Jc superior a 85.000 A cm-2 a 4,2 K.
- Se identificó que ciertos materiales de revestimiento reducen significativamente la corriente crítica, lo que indica un comportamiento de enlace débil inducido por la contaminación.
Conclusiones:
- La fabricación a presión ambiente es efectiva para producir alambres MgB2 de alto rendimiento.
- La elección del material de revestimiento es crucial para mantener las propiedades superconductoras de MgB2.
- Los cables MgB2 son prometedores para aplicaciones a granel si se abordan los desafíos de fabricación.
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