PRESSURE-DEPENDENCE OF CO-60 DIFFUSION IN AMORPHOUS CO76.7FE2NB14.3B7

被引：22
作者：
RATZKE, K
FAUPEL, F
机构：
[1] Institut F̈r Metallphysik, Abteilung Metallkunde, 3400 Göttingen
来源：
PHYSICAL REVIEW B | 1992年 / 45卷 / 13期
关键词：
D O I：
10.1103/PhysRevB.45.7459
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The pressure dependence of Co-60 diffusion has been measured in melt-spun amorphous Co76.7Fe2Nb14.3B7 and fcc Co, and the temperature dependence and the relaxation behavior were investigated in the metallic glass. A radio-tracer technique in conjunction with ion-beam sputtering for serial sectioning was employed. The samples were characterized by means of differential scanning calorimetry, electron microprobe analysis, and x-ray diffraction prior to and after the diffusion anneals. Within the experimental error margins, no pressure dependence was observed in amorphous Co76.7Fe2Nb14.3B7. The activation volume was found to be V = -(0.06 +/- 0.1)OMEGA, where OMEGA is the atomic volume of Co. This result shows that diffusion in the metallic glass is not mediated through quasivacancies in thermal equilibrium.
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收藏
页码：7459 / 7462
页数：4
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