Electron Diffraction Study On the Ordered Alloy CuAu
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概要
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The ordered state in the gold-copper alloy of the atomic ratio 1 to 1 was investigated by electron: diffraction with well orientated thin films. Below 340℃ the pattern corresponded with a tetragonal superlattice the e axis of which is distributed into three original cubic axes, while above 360℃ sharp crosses appeared at some of the positions of superlattice refection, being accompanied with subsidiary maxima, and at the same time regularly spaced satellites arose around normal reflections, especially, conspicuously around the incident beam position. The former phenomenon could be clearly interpreted by antiphase domains which occur in the tetragonal superlattice and which lead to the orthorhombic CuAu II structure, and the latter which was firstly found by this experiment proved that a definite expansion of lattice appears periodically in each boundary of antiphase domains, due to the asymmetrical distribution of gold and copper atoms at this place and to the tetragonality. Among the satellites around normal spots, only those around the direct spot are thought to be fundamental and those around the other normal spots arise from the secondary elastic scattering peculiar to electron diffraction and are the mere repetitions of the fundamental satellites. Thus, the lattice of CuAu II possesses the inherent defect of lattice which has hither-to been overlooked. The transitional region between CuAu II and the cubic phase in the equilibrium diagram was also studied, the composition of films being varied in the vicinity of 1 to 1, and it was concluded that the two phases surely coexist as in case of CoPt.
- 社団法人日本物理学会の論文
- 1954-08-25
著者
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Ogawa Shiro
The Rcsearch Institute For Iron Steel And Other Metals Tohoku University
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Watanabe Denjiro
The Rcsearch Institute For Iron Steel And Other Metals Tohoku University
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