Impact of carbon nanotubes addition on transport and superconducting properties of YBa2Cu3O7−δ ceramics. Issue 8 (1st June 2018)

• Record Type: Journal Article
• Authors: Khalid, Nurul Auni; Kechik, Mohd Mustafa Awang; Baharuddin, Nur Atikah; Kien, Chen Soo; Baqiah, Hussein; Yusuf, Nur Nabilah Mohd; Shaari, Abdul Halim; Hashim, Azhan; Talib, Zainal Abidin
• Is Part Of: Ceramics international. Volume 44:Issue 8(2018)
• Page Start: 9568
• Page End: 9573
• Publication Date: 2018-06-01
• Subjects: Carbon nanotubes -- YBa2Cu3O7−δ -- Critical current density -- Pinning center -- Microstructure; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.02.178
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: YBa2 Cu3 O7−δ (Y-123) ceramics added with small amounts (0.0 – 0.8 wt%) of carbon nanotubes (CNTs) were synthesized using co-precipitation process. The effects of CNTs addition on the critical temperature ( T c ), critical current density ( J c ) measured at 30 K in self-field, phase formation and microstructure properties including elemental compositional analysis were studied. The onset ( T c-onset ) and offset critical temperatures ( T c-offset ) reduced with increasing CNTs concentration up to x = 0.6 wt% and then increased for sample x = 0.8 wt%. The metallic behaviour of Y-123 changes to semiconducting behaviour with the addition of CNTs. Introduction of CNTs improved J c significantly. The J c for pure sample, with volume fraction of 96.2% of Y-123, is 11 A/cm 2 . The highest value of J c, 477 A/cm 2, is observed for sample x = 0.2 wt%. Sample x = 0.8 wt% shows the highest T c with good crystallinity and orthorhombicity factor among the added samples. The result suggests the enhancement of J c may be caused by flux pinning phenomena with the introduction of CNT's in Y-123 host system.