Spatial periodicities of defect environments in 57Fe3A1 studied by Mössbauer powder diffractometry
作者： Jiao Y. Y. Lin , Brent Fultz
DOI: 10.1524/ZKRI.219.3.172.29095
关键词: Crystallography 、 Mössbauer effect 、 Transmission electron microscopy 、 Diffraction 、 Resonance 、 Transition metal 、 Mössbauer spectroscopy 、 Superlattice 、 Chemistry 、 Cubic crystal system 、 Molecular physics
摘要: Mossbauer powder diffractometry was used to study partially-ordered 57 Fe 3 Al. Multiple diffraction patterns were measured at Doppler velocities across all nuclear resonances in the sample. The superlattice diffractions analyzed provide data on long-range order of atoms having different numbers Al neighbors. Comparing experimental calculations showed that three as first-nearest neighbors (1nn) have simple cubic order, similar with four 1nn. periodicity 1nn significantly lower than expected for homogeneous antisite disorder, however. Monte-Carlo simulations and transmission electron microscopy suggest a significant fraction aperiodic are near antiphase domain boundaries.
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