Role of C: Zr stoichiometry in the formation of a nanocrystalline structure and magnetic properties in Fe87-x
Zr13Cx films |
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Authors: | E N Sheftel’ A V Shalimova G Sh Usmanova O A Bannykh |
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Affiliation: | (1) Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Leninskii pr. 49, 119991, Russia;(2) Bardin Central Research Institute for the Iron and Steel Industry, Vtoraya Baumanskaya ul. 9/23, Moscow, 107005, Russia |
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Abstract: | X-ray diffraction analysis was used to study the structure of as-sputtered and annealed Fe-13 at. % Zr-C films, which were produced by reactive magnetron sputtering and characterized by stoichiometric and nonstoichiometric (with respect to ZrC) at. % C to at. % Zr ratios. A special packet of programs was used to resolve wide reflections observed in X-ray diffraction patterns of the films. The as-sputtered films of all compositions were found to be amorphous in terms of X-ray diffraction. The thermal stability of the amorphous phase increases as the C: Zr ratio in the films departs from the stoichiometric ratio (1: 1) characteristic of the monocarbide ZrC. Annealing leads to the formation of a mixed (amorphous + nanocrystalline) structure. Depending on the carbon content and annealing temperature, the phase composition of the films is represented by different combinations of phases, such as bcc α-Fe (the basis phase), fcc ZrC, monoclinic Fe2C, monoclinic Fe2.5C, orthorhombic Fe3C, and Fe23Zr6. After annealing at 550°C, the best magnetic properties are characteristic of the films having the stoichiometric composition with respect to ZrC (at. % C: at. % Zr ~ 1). |
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