Citation
Dihom, Mustafa Mousa and Shaari, Abdul Halim and Baqiah, Hussein and Al-Hada, Naif Mohammed and Talib, Zainal Abidin and Chen, Soo Kien and Azis, Rabaah Syahidah and Kechik, Mohd Mustafa Awang and Lim, Kean Pah and Abd-Shukor, Roslan
(2017)
Structural and superconducting properties of Y(Ba1-xKx)2Cu3O7-δ ceramics.
Ceramics International, 43 (14).
11339 - 11344.
ISSN 0272-8842; ESSN: 1873-3956
Abstract
Y(Ba1-xKx)2Cu3O7-δ ceramics (x = 0.00, 0.03, 0.05 and 0.08) were synthesized by thermal treatments of aqueous solution of metals nitrates and polyvinyl pyrrolidone (PVP) that acts as a capping agent. The effects of K-substitution on the crystal structure, microstructure and electrical resistance of samples were investigated. The X-ray diffractions results indicated an improvement of crystallinity and variation of lattice constant, a, b and c of YBa2Cu3O7-δ (Y123) phase with K-substitution. The K-substitution resulted in increasing of orthorhombicity factor compared to pure Y123. Microstructural observation using scanning electron microscopy showed that K-substitution promotes the grain growth of Y123. The superconducting transitions (Tc) of the substituted-samples were higher than that of the pure Y123. The Tc (onset) were 93, 97, 95, 95 K for the samples with x = 0.00, 0.03, 0.05 and 0.08, respectively. Comparing with pure sample, the substituted-samples showed sharper superconducting transition (ΔTc). The best superconducting properties was observed for sample with x = 0.03.
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