Distributions of the Hg, Pb and Tl atoms in a single grain of a Hg0.55Pb0.25Tl0.2Ba2Ca2Cu3Oy superconductor

✍ Scribed by J.C.L. Chow; P.C.W. Fung; H.M. Shao

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 451 KB
• Volume: 247
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)01182-1

✦ Synopsis

Surplus and deficient regions of Hg, Pb and TI atoms are found at some edges of a typical Hgo.55Pbo.asTlo.2BazCa2Cu3Oy superconducting grain. The formation of these regions can be explained by a simple model which takes into account the growth of grains during the Hg superconducting phase formation process. These surplus and deficient regions result in a reduction of Hg superconducting phase and hence increase the amount of weak links among the superconducting grains. This leads to a decrease of critical temperature compared to that of the Hg samples which are only substituted with either Pb or T1.