Bilayered scale of NiO is formed on not only impure but high-purity nickel by heating in air at temperatures of 900 to 1200°C for times up to 72 hr. It is found that scales consist of two layers which are metallographically and/or crystallographically different from each other. They can be classified into several types according to their metallographic and crystallographic structures.
(Received September 18, 1972)
* Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo, Japan.
© 2002 The Japan Institute of Metals
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