Mössbauer Diffractometry on Chemical Sites of ⁵⁷Fe in Fe₃Al

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• 作者：Lin ; J. Y. Y. ; Fultz ; B. ; Kriplani ; U.
• 关键词：M枚ssbauer diffraction ; interference ; coherence ; ordered alloys ; Fe3Al
• 刊名：Hyperfine Interactions
• 出版时间：2002
• 出版年：2002
• 期刊代码：18_03043843
• 类别：cp
• 卷：141/142
• 期：1/4
• 页码：145-150
• 数据来源：sp

摘要

A Mössbauer powder diffractometer was used to measure diffraction patterns from polycrystalline ⁵⁷Fe₃Al. The intensities of Bragg diffractions were measured when the incident γ-rays were tuned to different resonances of the Mössbauer spectrum. The bcc fundamental diffractions were strong, and superlattice diffractions of (1/2 1/2 1/2) and (1 0 0) families were measurable. The ⁵⁷Fe local environments with 0 Al and 4 Al first-nearest-neighbors had the periodicities expected from their sites in the perfect D0₃ unit cell, but the long-range periodicity of the 3 Al environment was also measured. This disordered site had a surprisingly high degree of B2 long-range order.