Lanthanide oxides: effect of CO2 on the Yb2O3 hydration

✍ Scribed by I. Carrizosa; J.A. Odriozola; J.M. Trillo; M.F. Ebel

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 319 KB
• Volume: 94
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)94584-5

✦ Synopsis

superconductor; p suddenly decreases below 5.5 K and tends to zero below 2 K. Nevertheless, the amount of the decrease of p is found to depend on the surface state. The sample which is gently rubbed by a soft tissue paper so that it becomes more shiny immediately before mounting on the sample holder, has much smaller decrease of p. This is shown for p of Wb5Sn0.5)3.

Curve A is with this rubbing and curve B is without. Thus we conclude that the superconducting state is not due to bulk sample, but is due to deposits of In-Sn alloy on the sample surface. These deposits are likely to be the eruptions on the sample surface observed by scanning electron microscope. In Ce(Ino.3Sno.,)3, the decrease of p is clearly seen to have two steps. This is understood because the In-Sn alloy is eutectic and In0.3Sn, , consists of two components with different compositions and with different superconducting temperatures. The values of these two temperatures are near to those reported [2] on In-Sn alloys, and prove a small amount of this alloys actually deposited on sample surface.