Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 Selective Oxidation due to the Heating of the Evaporated Film of a-Brass N. Takahashi and K. Mihama Yainanashi University, Kofii, and Japan Electron Optics Laboratory Co., Ltd., Tokyo It is well known that, when an alloy is heated in the air, one of the constituent metals is oxidized selectively [6]: these conditions are determined by the temperature and the pressure [3]. On a-brass, it has been known that CuoO is formed at a low temperature a
Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 Selective Oxidation due to the Heating of the Evaporated Film of a-Brass N. Takahashi and K. Mihama Yainanashi University, Kofii, and Japan Electron Optics Laboratory Co., Ltd., Tokyo It is well known that, when an alloy is heated in the air, one of the constituent metals is oxidized selectively [6]: these conditions are determined by the temperature and the pressure [3]. On a-brass, it has been known that CuoO is formed at a low temperature and ZnO is developed at a high tempe- rature [6]. We have prepared the single crystal film of a-brass by evaporation /// vacuo and we have performed the experiment on the selective oxidation by heating in the electron microscope when observing the electron microscopic and the electron diffraction images continuously. (At the place of the specimen chamber of the JEM-5 electron microscope with a four-lens system, the specimen heating or cooling adaptors can be introduced. These adaptors make it possible to study continuously the thermal change of the specimen in the ranges from room temperature to about 1000 C or from about r200 C to the liquid nitrogen temperature respectively.) A single crystal of a-brass has been prepared by successive evaporation of copper and zinc /'// vacuo onto the cleavage surface of rock salt which was kept at about 400''C. To obtain a single crystal of a-brass, copper must be evaporated prior to zinc without breaking the vacuum.
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