Mechanism of the structural phase transformations in epitaxial YHx switchable mirrors
| Autor: | Bernard Dam, Jacob W. J. Kerssemakers, J.Th.M. De Hosson, R.C.C. Ward, Bart J. Kooi, Edzo Zoestbergen |
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| Přispěvatelé: | Zernike Institute for Advanced Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: |
Materials science
HYDRIDE PRECIPITATION Condensed matter physics Plane (geometry) business.industry YTTRIUM General Physics and Astronomy Substrate (electronics) OPTICAL-PROPERTIES HYDROGEN FILMS Crystal Optics Transmission electron microscopy TITANIUM Partial dislocations Deformation (engineering) business High-resolution transmission electron microscopy Crystal twinning |
| Zdroj: | Journal of Applied Physics, 91(4), 1901-1909. AMER INST PHYSICS |
| ISSN: | 0021-8979 |
| DOI: | 10.1063/1.1431427 |
| Popis: | The detailed mechanisms of the structural phase transformations that occur in epitaxial Y-hydride switchable mirrors are revealed with high resolution transmission electron microscopy (both cross sectional and plan view). The triangular ridge network that develops in Y prior to the α-β transformation is a result of 101̄2 deformation twinning. The basal plane that is originally parallel to the film/substrate interface is rotated by twinning over 5.6° and transformed into a prismatic plane and similarly the prismatic plane is transformed into a basal plane giving a final crystal reorientation for the ridge of 95.6°. After transformation to β, nearly vertical Σ3111 twin boundaries arise in the ridges. In contrast, horizontal twin boundaries develop in the β domains to prevent macroscopic shape changes. Inbetween the two twin variants within the domains, Shockley partial dislocations are persistently present, which enable efficient reversible β-γ switching of the mirror. © 2002 American Institute of Physics. |
| Databáze: | OpenAIRE |
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