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Enhancement of critical current density in TlBaCaCuO type superconductors by the addition of SnO2

✍ Scribed by Zhifeng Ren; Min Qi; Jui H. Wang

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
670 KB
Volume
184
Category
Article
ISSN
0921-4534

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✦ Synopsis

The addition of SnO2 to a mixture of TI203 and Ba2Ca3Cu307 was found to enhance the critical current density (Jc) of the subsequently fabricated superconductor. Without SnO2, the Jc of the silver-sheathed superconductor of optimal thallium content was 7.4 to 7.6 × 103 A/cm 2 at 77 K and zero external magnetic field. With the addition of 0.1 formula-weight of SnO2 per formulaweight of the superconductor, its Jc was raised to 1.1 to i.2× 104 A/era 2 under the same conditions. XRD data show that the ratio of 2223-phase can be greatly increased by the addition of SnO2 and rapid quenching of the hot pellet in liquid nitrogen. However, SEM and EDAX analyses show that the superconducting phase in the ceramic sample does not contain Sn and suggest that the role of SnO2 is to stabilize the 2223-phase and improve intergranular or interfacial contact.

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