Self-organized layered structure in epitaxially stabilized FeSi
Institute of Physics and Astronomy, University of Aarhus,
DK-8000 Aarhus C, Denmark
2 Laboratory for Solid State Physics, ETH-Zürich - CH-8093 Zürich, Switzerland
3 Istituto Nazionale di Fisica della Materia, Dipartimento di Fisica dell'Universita', Via Celoria 16, I-20133 Milano, Italy.
Accepted: 28 November 1996
Conversion electron Mössbauer spectroscopy and transmission electron microscopy investigations of epitaxially stabilized c-FeSi having the CsCl structure reveal a self-organized layered structure. Upon annealing the structural phase transition to the bulk stable ϵ-FeSi phase leaves the superlattice periodicity intact with surprisingly sharp interfaces. A distorted CsCl phase which tranforms into the ϵ-FeSi phase at a temperature slightly higher than that for the partially relaxed c-FeSi is identified in the as-grown sample. Molecular-dynamics simulations have been used to visualize and interpret the distorted phase and the structural phase transition.
PACS: 76.80.+y – Mössbauer effect; other gamma-ray spectroscopy / 75.50.Bb – Fe and its alloys / 64.70.Kb – Solid-solid transitions
© EDP Sciences, 1997