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X-Ray Absorption Studies of Fe_{73.5}Cu_{1}Nb_{3}Si_{15.5}B_{7} Amorphous and Nanocrystalline Alloys

100%
Swilem Y., Sobczak E., Nietubyć R., Ślawska-Waniewska A., Dynowska E.
Acta Physica Polonica A
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1997
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vol. 91
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issue 5
883-886
EN
The nanocrystalline state of the formally amorphous alloy Fe_{73.5}Cu_{1}Nb_{3}Si_{15.5}B_{7} is achieved by a heat treatment at temperatures between 500°C and 600°C. The XANES and EXAFS methods were applied for investigation of local structure and chemical bonding around Fe atoms in amorphous and nanocrystalline alloys. The Fe K absorption spectra were measured in the transmission mode at room temperature for Fe_{73.5}Cu_{1}Nb_{3}Si_{15.5}B_{7} amorphous and nanocrystalline alloys and compared with the spectra for Fe metallic foil and Fe_{3}Si polycrystalline samples.
2
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C_{60}FeC_{60} Complexes in Fe Intercalated Fullerite Studied by X-Ray Absorption

86%
Sobczak E., Traverse A., Nietubyć R., Swilem Y., Byszewski P., Żymierska D.
Acta Physica Polonica A
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1997
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vol. 91
|
issue 5
877-881
EN
The aim of Fe K edge XANES and EXAFS studies is to reveal the local structure around Fe ions in C_{60}Fe_{x} intercalated fullerites. The measurements are performed in transmission mode at LN_{2} temperature for C_{60}Fe_{x} powder samples and other materials: ferrocene Fe(C_{5}H_{5})_{2}, Fe metal foil and α-Fe_{2}O_{3}. The main result is that the XAFS spectra of the C_{60}Fe_{2} intercalate is almost identical to that of ferrocene and very different from α-Fe and α-Fe_{2}O_{3}. The results support opinion that in the C_{60}Fe_{x} intercalates the ferrocene-like bonds in complexes C_{60}FeC_{60} are formed. Additionally, the XAFS spectra showed that neither remarkable amount of Fe metallic clusters nor oxidized iron particles are present in the C_{60}Fe_{x} sample.
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