Películas gruesas superconductoras de YBCO para conductores recubiertos.
Keywords:
Películas gruesas superconductoras, cintas superconductoras, conductores recubiertos, YBCO, Fundido-Templado- Recocido (FTR). (es)Superconducting thick films, Coated conductors, YBCO, Melt-Quench-Annealing method (MQA) (en)
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Películas gruesas superconductoras de YBa2Cu3O7−δ (YBCO) han sido producidas mediante el método de Fundido- Templado-Recocido (FTR), sobre substratos de MgO (100), para la fabricación posterior de cintas superconductoras de alta temperatura crítica. Las películas presentaron temperaturas críticas (Tc) de aprox. 89K y densidades de corriente crítica (Jc) > 103 A/cm2 a 77K en ausencia de campo magnético aplicado. La difracción de rayos X (DRX) mostró básicamente la estructura correspondiente al YBCO (123) sin una orientación preferencial y la microscopía electrónica de barrido (SEM) presentó muestras granulares, con tamanños de grano dependientes del tratamiento térmico.
YBCO superconducting thick films for coated conductors have been produced on MgO (100) substrates using a Melt- Quench -Annealing method (MQA).The superconducting transition was around 89K, and critical current densities > 103 A/cm2 were achieved at 77K, and non-applied magnetic field. The films displayed the YBCO (123) structure without a noticeable texture as determined by X-ray dif- fraction. On the other hand scanning electron microscopy (SEM) showed granular samples with grain sizes dependent of heat treatments.
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