| abstract |
An alloy for use in the manufacture of tunnel diodes (see Division H1) consists of 99 parts by weight indium, 0.5 parts gallium and 0.5 parts zinc. The tunnel diode produced by fusing this alloy to an N type germanium body is freed of surface imperfections by treatment in a slow iodide etch and then electroplated with a thin layer of nickel from an aqueous solution containing 32 ozs. nickel sulphate, 6 ozs. of nickel chloride and 4 ozs. of boric acid per gallon of water. The bath has a pH of 4.5-6. |