Order-disorder phase transition in CoPd thin films |
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Authors: | E M Artem’ev M E Artem’ev |
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Institution: | (1) Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka Kanagawa, 237-0061, Japan;(2) Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;(3) Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun Hyogo, 679-5198, Japan |
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Abstract: | The thin films of a CoPd alloy in the equiatomic composition region are prepared by condensation at different substrate temperatures.
The substrate temperature is varied from the liquid nitrogen temperature to +280°C. At low substrate temperatures, the crystal
structure of the condensed films is the single-crystal blocks of the hexagonal close-packed (hcp) phase. As the substrate
temperature is further increased, the domains characterized in the initial state by the microdiffraction patterns in the form
of a diffuse halo appear in the films, and these domains have a clear-cut boundary with the regions indicated by point reflections
in the electron diffraction patterns. At substrate temperatures from +150 to 160°C, the CoPd alloy films in the equiatomic
composition region are fully amorphous. The given state is a polymorphic transformation of the martensitic type. It arises
in the martensitic transformation of the low-temperature hcp phase to the high-temperature fcc phase. |
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