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Fe Clusters in Fe Intercalated Fullerite

100%
Sobczak E., Żymierska D., Byszewski P., Traverse A.
Acta Physica Polonica A
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1997
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vol. 91
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issue 2
447-450
EN
The local structure around Fe ions in the C_{60}Fe_{2} fullerites before and after heat treatment in temperature of 850 K was investigated by means of Fe K edge X-ray absorption near edge structure and extended X-ray absorption near edge structure methods. The X-ray absorption measurements were performed at liquid nitrogen temperature using synchrotron radiation in transmission mode. The X-ray absorption near edge structure and extended X-ray absorption near edge structure studies showed that the heat treatment of the C_{60}Fe_{2} fullerite at temperature 850 K causing an irreversible transition from monoclinic to fcc structure is accompanied with changes in the state of Fe ions, part of them forms clusters in bcc structure, while others turn to Fe^{3+} ions bonded to fullerenes.
2
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X-Ray Absorption Study of Ti, Cu and Fe Implanted AlN

100%
Borowski M., Traverse A., Mimault J.
Acta Physica Polonica A
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1994
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vol. 86
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issue 5
713-719
EN
Sintered AlN ceramics were implanted by Ti, Fe and Cu ions up to 1.9 × 10^{17} atoms/cm^{2} at mean energies of 70-110 keV in order to investigate the role of the chemical properties of the implanted species. on the phase formed during the implantation process. X-ray absorption studies were performed at room and at liquid nitrogen temperature to give information on the resulting systems and local environments of the Ti, Fe and Cu atoms. We observe the formation of TiN even for as-implanted samples, while the Cu ions aggregate to clusters. The Fe implanted samples show an intermediate behavior with both nitride formation and Fe clustering. In conclusion, the heat of formation is found to be a key parameter for the final system.
3
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Chemical Shifts at K-Absorption Edges of Transition Metals Admixed To ZnS and ZnSe

100%
Iwanowski R. J., Ławniczak-Jabłońska K., Traverse A.
Acta Physica Polonica A
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1997
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vol. 91
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issue 4
803-808
EN
This paper gives the experimental evidence of systematic X-ray K-absorption edge studies in an effort to analyse the effect of cation chemical shift in the group of compounds type Zn_{1-x}M_{x}A (M = Mn, Fe, Co, Ni; A = S, Se). The observed chemical shift was found practically independent of the choice of anion, whereas it revealed a noticeable decrease when passing from Mn to Zn. The effect was ascribed to the change of the 3d shell occupation. The calculations of the effective cation charge (based on the theoretical approach of Kitamura and Chen, 1991) have shown that in the case of transition metals admixed to ZnS and ZnSe there is a contribution of the 3d electrons to the overall charge transfer, which indicates that the ability of 3d electrons to participate in predominantly ionic bond decreases with 3d orbit filling.
4
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C_{60}FeC_{60} Complexes in Fe Intercalated Fullerite Studied by X-Ray Absorption

76%
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
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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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