日本金属学会誌

J. Japan Inst. Metals, Vol. 51, No. 4 (1987),
pp. 338-341

High Temperature Oxidation Behavior of Rare Earth Metals Sm, Eu and Gd

Tsuyoshi Arakawa1, Yasuko Ohno2 and Jiro Shiokawa1

1Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita
2Undergraduate Student, Faculty of Engineering, Osaka University, Suita. Present address: Mitsubishi Electric Co., Ltd., Amagasaki

Abstract:

Oxidation of Sm, Eu and Gd was investigated by conventional weight gain tests and SEM with small plates (1 mm×1 mm×0.2 mm) and by the measurement of resistivity of metal thin films in oxygen atmosphere at elevated temperatures. The temperature at which the oxidation of Sm thin film (thickness: 1 μm) began was 780 K and was close to that for the oxidation of Sm metal plate. Thin films of Eu and Gd (thickness: 1 μm) oxidized abruptly above about 400 K. However, the oxidation temperatures of the metal plates differed largely from one another. The reaction kinetics for Sm was parabolic and the others obeyed a linear oxidation law. The values of the activation energy of oxidation were compared with those reported in the literature. Further, the state of surface oxide was briefly discussed on the basis of the SEM photographs of cross sections of the oxidized Eu and Gd plates.


(Received 1986/8/18)

Keywords:

rare earth metal, samarium, europium, gadolinium, thin film, high temperature oxidation, oxidation kinetics


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