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Weak Ferromagnetism of Fe Intercalated Fullerides

100%
Byszewski P., Diduszko R., Baran M.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
297-302
EN
The magnetic properties of C_{60}Fe_{x} resemble spin glass with the freezing onset above 200 K. The unusual magnetization behavior at intermediate temperatures is ascribed to bonds reorganization.
2
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Free Radicals in K and Rb Admixtured Fullerene C_{60}

100%
Stankowski J., Kempiński W., Byszewski P., Trybuła Z.
Acta Physica Polonica A
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1993
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vol. 84
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issue 6
1117-1123
EN
Molecules of C_{60} form Van der Waals type crystals. The observations reported here concern EPR investigations of such C_{60} samples with only a slight amount of Rb or K. Detected defects are (C_{60})^{+} or (C_{60})^{y-} ion-radicals. A hole (h) or trapped electron (t) are localized on one fullerene ball. In the case of potassium fullerites C_{60}:K the line shape of EPR signal was of the Dysonian form which is characteristic of conducting electrons in metal. The EPR lines of holes (C_{60})^{+} are characterized by g_{h} ≥ g_{0} whereas for electrons g_{t} is below the value g_{0} = 2.0023 characteristic of a free electron (g_{t} ≤ g_{0}). The EPR linewidth 2ΔB^{h}_{1s} of the (C_{60})^{+} weakly increased with decreasing temperature whereas the EPR linewidth attributed to the electron 2ΔB^{t}_{1s} significantly decreases with decreasing temperature. The C_{60}:K sample reached superconducting phase below T_{c} = 11 K which is significantly less than T_{c} = 16.5 K observed for K_{x}C_{60} where 2 ≤ x ≤ 4.
3
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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.
4
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Preparation and Some Properties of Carbon Nanotubes

88%
Byszewski P., Ukalski K., Baran M., Dlużewski P., Kozłowski M.
Acta Physica Polonica A
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1995
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vol. 87
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issue 4-5
885-891
EN
Carbon nanotubes can be grown in the DC electric arc, they grow cov­ered by a turbostratic graphite. The mechanism of the tubes growth is dis­cussed. The magnetic susceptibility of samples, which contained aligned nan­otubes exhibits anisotropic oscillatory behavior, which is ascribed to spatial quantization of the energy levels.
5
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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.
6
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Solid Solutions of Oxide Crystals as Substrates for Epitaxial Layer Depositions

76%
Berkowski M., Fink-Finowicki J., Aleksijko R., Diduszko R., Byszewski P., Kikalejshvili-Domukhovska R.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
457-463
EN
We present results of investigation on growth of solid solution crystals with perovskites and K_2NiF_4 structures used as substrates for epitaxy. Perovskite single crystals with no twins and crystals with K_2NiF_4 structure with the lattice parameter in the range 3.876-3.819Å and 3.754 to 3.688Å, respectively, can be grown. Here preliminary results on investigation on growth of other solid solution crystals with the lattice constant from 3.946 to 3.688Å are also presented thus covering the whole interesting range for depositing oxide materials. These crystals can be grown by the Czochralski method that secures their high structural quality. Discussed crystals are resistant to reaction with the deposited oxide layers.
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