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Electrodeposition of Superconductive Tin

IP.com Disclosure Number: IPCOM000097564D
Original Publication Date: 1961-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Tsu, I: AUTHOR

Abstract

An acid plating bath is utilized for preparing pure superconductive films of tin which adhere firmly to the substrate. Such films are ductile, non-pitted and have physical characteristics comparable to the bulk material. The films also exhibit a sharp transition temperature in the same range as the bulk material.

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Electrodeposition of Superconductive Tin

An acid plating bath is utilized for preparing pure superconductive films of tin which adhere firmly to the substrate. Such films are ductile, non-pitted and have physical characteristics comparable to the bulk material. The films also exhibit a sharp transition temperature in the same range as the bulk material.

Addition of a small amount of saccharin to an acid plating bath prevents the film from stripping off the electrode. With a particular bath composition, the superconductive tin films thus prepared exhibit a sharp resistance versus temperature transition at temperatures comparable to that of bulk tin.

In a typical run, a metallic tin layer is deposited on a flat plastic substrate which has been flashed with a copper surface or on conductive glass. To produce films of 700 angstroms thickness, the plating is carried out for about 30 sec. at a current density of 100 amperes per sq. ft. Variation in the thickness of the deposit is controlled by the plating time.

Examples of suitable bath compositions are as follows: BATH PARAMETER MAXIMUM PREFERRED MINIMUM SnSO(4) 180 g/1 100 g/1 30 g/1 C(4)H(6)O(6) (Tartaric Acid) 60 g/1 30 g/1 0 g/1 Saccharin 3 g/1 0.8 g/1 0.4 g/1 Sodium Lauryl Sulfate
0.5 g/1 .1 g/1 0 g/1 Sn++ 99 g/1 55 g/1 16.5 g/1 C(4)H(4)O(6) = 59.7 g/1 29.8 g/1 0 g/1 pH(H(2)SO(4))
1.5 g/1 1.2 0.9 T( degrees C) 90 degrees C 60 degrees C 25 degrees C Current Density (Amps per sq.ft.) 300 ASF 100 ASF 40 ASF

Tartaric...