Use of conventional electrochemical techniques to produce crystalline FeRh alloys induced by Ag seed layer
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2013-05-09
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By combining galvanic displacement and electrodeposition techniques, an ordered Fe20Rh80 structure deposited onto brass was investigated by X-ray diffractometry, Mössbauer spectroscopy and magnetization measurements. Mössbauer and X-ray diffraction analyses suggest that the Fe-Rh alloy directly electrodeposited onto brass displays a nanocrystalline state while a similar alloy deposited onto Ag/brass shows a faced centered cubic-like structure, with dendrites-like features. These results directly indicate that the presence of Ag seed layer is responsible for the Fe-Rh alloy crystallization process. In addition, room temperature Mössbauer data indicate firstly paramagnetic states for two Fe-species. In the dominant Fe-species (major fraction of the Mössbauer spectra), Fe atoms are situated at a cubic environment and it can be attributed to the γ-Fe20Rh80 alloy based on their hyperfine parameters. In the second species, Fe atoms are placed in a non-local symmetry, which can be related to Fe atoms at the grain boundaries or/and Fe small clusters. These Fe-clusters are in superparamagnetic state at room temperature, but they may be ordered below 45 K, as suggested by magnetization data. © 2013 Elsevier B.V. All rights reserved.
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Ag seed layer , Electrodeposition , FeRh alloys , Galvanic displacement , Ag seed layers , Electrochemical techniques , Electrodeposition technique , Fe-Rh alloy , Magnetization measurements , Ssbauer spectroscopies , Superparamagnetic state , Atoms , Brass , Deposits , Grain boundaries , Iron alloys , Magnetization , Molybdenum , Rhodium , Silver alloys , Superparamagnetism , X ray diffraction , X ray diffraction analysis , Nanocrystalline alloys
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Journal of Alloys and Compounds, v. 573, p. 37-42.