| http://www.w3.org/ns/prov#value | - Further, the first electrode made of a metal such as aluminium and formed in a thickness of 3,000 to 5,000 A may be subsequently treated in an atmosphere of oxygen at a temperature of 380 to 450 C for about 1 to 2 hours thereby to form on the surface of the first electrode an oxidized layer having a thickness of about 50 to A which is smooth, pure and free from pinholes.
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