Use of conventional electrochemical techniques to produce crystalline FeRh alloys induced by Ag seed layer

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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.



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.