Structural and superconducting properties of Y(Ba1-K )2Cu3O7-δ ceramics
| Autor: | Roslan Abd-Shukor, Rabaah Syahidah Azis, Mohd Mustafa Awang Kechik, Lim Kean Pah, Abdul Halim Shaari, Mustafa Mousa Dihom, Zainal Abidin Talib, Hussein Baqiah, Naif Mohammed Al-Hada, Chen Soo Kien |
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| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Materials science Scanning electron microscope Process Chemistry and Technology 02 engineering and technology Thermal treatment Crystal structure 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Grain growth Crystallinity Crystallography Lattice constant 0103 physical sciences Materials Chemistry Ceramics and Composites 010306 general physics 0210 nano-technology |
| Zdroj: | Ceramics International. 43:11339-11344 |
| ISSN: | 0272-8842 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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