Magnetic properties of Ni x Co1 − x nanoparticles in carbon nanotubes

X-ray diffraction analysis, nuclear magnetic resonance, and low-temperature magnetic measurements were used to study the structure and magnetic parameters of nanoparticles Co^sub 1 - x^Ni^sub x^ (x = 0-100 at. %) located inside carbon nanotubes. It has been established that the behavior of the excha...

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Published in:Physics of metals and metallography 2006-12, Vol.102 (S1), p.S67-S70
Main Authors: Komogortsev, S. V., Iskhakov, R. S., Shaikhutdinov, K. A., Mal’tsev, V. K., Okotrub, A. V., Kudashov, A. G., Shubin, U. V.
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Nuclear magnetic resonance
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creator Komogortsev, S. V.
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description X-ray diffraction analysis, nuclear magnetic resonance, and low-temperature magnetic measurements were used to study the structure and magnetic parameters of nanoparticles Co^sub 1 - x^Ni^sub x^ (x = 0-100 at. %) located inside carbon nanotubes. It has been established that the behavior of the exchange constant versus alloy composition A(x) is nonmonotonic. This fact is unexpectable from the thermodynamic viewpoint and primary X-ray diffraction analysis, which show that only an fcc structure is characteristic of all Co^sub 1 - x^Ni^sub x^ particles. An analysis of structure defects using X-ray diffraction and NMR spectra explains the observed anomalies of magnetic properties as a result of the highly defect structure of ferromagnetic Co nanoparticles, which are formed as close-packed fcc structures with numerous stacking faults (layers of an hcp structure).[PUBLICATION ABSTRACT]
doi_str_mv 10.1134/S0031918X06140171
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subjects NMR
Nuclear magnetic resonance
title Magnetic properties of Ni x Co1 − x nanoparticles in carbon nanotubes
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