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Solubility of nickel in the YBaCuO high Tc superconductor

✍ Scribed by G.W. Kammlott; T.H. Tiefel; R.A. Fastnacht; S. Jin

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
204 KB
Volume
8
Category
Article
ISSN
0921-5107

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✦ Synopsis

Microstructural and X-ray analyses were carried out on the Y-Ba-Cu-O superconductor compound doped with nickel. It is shown that there is a limited solubility of nickel in YBa2Cu307_ 6 with a resultant T¢ (midpoint) slightly below liquid nitrogen temperature. Partial melting caused a sharp superconducting transition near 77 K. The maximum solubility of nickel in YBa2(CUl -xNix)307-6 has been determined by energydispersive X-ray analysis to be x ~-0.09. The nickel in excess of the solubility limit is found to be present as isolated nickel oxide particles embedded in the Y-Ba-Cu-O phase.

The T c of the nickel-doped Y-Ba-Cu-O can be fine tuned to produce a large change in resistivity near liquid nitrogen temperature, which could be useful for obtaining large signal changes in devices operating at about 77 K.

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