Diffusion and intercalation of fluorine into highly oriented pyrolytic graphite: An<i>in situ</i>ESR study

Palchan, I.; Davidov, D.; Zevin, V.; Polatsek, G.; Selig, H.

doi:10.1103/physrevb.32.5554

“…Therefore, assuming the probability of spin reorientation of graphite current carriers during such collisions to be non-zero, the increase of the total rate of spin relaxation of graphite current carriers (the graphite CESR linewidth) with the time of intercalation can be observed. Note, that in all previous ESR experiments on graphite intercalation [4][5][6][7][8][9] which were carried out on HOPG plates with l ) d c , no broadening of the graphite CESR signal was observed. This indirectly supports our interpretation of the graphite CESR signal broadening at the intercalation of the narrow (l % 2d c ) HOPG plate.…”

Section: Discussionmentioning

confidence: 97%

“…The Conduction ESR (CESR) technique is one of the most powerful methods for studying the graphite intercalation process, because shapes and intensities of the CESR signal both from non-intercalated and intercalated regions of graphite plate vary strongly during the intercalation. However, because of the difficulty of such experiments only a few CESR studies of the graphite intercalation process have been undertaken [4][5][6][7][8][9]. But even in these cases, because of the presence of the skin effect, the interpretation of changes in the graphite CESR signal during the intercalation process is difficult.…”

Section: Introductionmentioning

confidence: 99%

Diffusion and Intercalation of Nitric Acid into Highly Oriented Pyrolytic Graphite: An in situ Conduction ESR Study

Зиатдинов

¹

,

Kainara

²

,

Krivoshei

³

2000

phys. stat. sol. (a)

0

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Results of an in situ conduction ESR (CESR) study of HNO 3 molecule intercalation into narrow highly oriented pyrolytic graphite (HOPG) slabs are presented. The changes in the graphite CESR signal line shape, intensity and linewidth and the step-wise changes both of intensity and linewidth of the CESR signal from the intercalated sample have been clearly detected during this reaction. Under the assumption that the graphite CESR signal evolution is caused by the advance of a boundary separating the intercalated and non-intercalated HOPG, the constant of two-dimensional diffusion of nitric acid molecules into HOPG and the average value of the spin reorientation probability during the collision of current carriers with this interface have been extracted from the experimental data. ExperimentalCESR measurements were carried out at room temperature using an X-band E-line spectrometer. The constant magnetic field (H 0 ) modulation frequency and amplitude A. M. Ziatdinov et al.: Graphite Intercalation by Nitric Acid: CESR study 709

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“…Therefore, at nonzero probability of spin reorientation during such collisions, the increase of the total rate of spin relaxation of current carriers (the CESR linewidth) with the time of intercalation can be observed. Note that in all previous ESR experiments on graphite intercalation [4][5][6][7][8][9] which were carried out on HOPG plates with I » 8^, a similar broadening of the graphite CESR signal was not observed. This is an indirect evidence supporting the proposed interpretation of the graphite CESR signal broadening at the intercalation of the narrow (l -28e) HOPG plate.…”

Section: Discussionmentioning

confidence: 98%

“…Conduction electron-spin resonance (CESR) technique is one of the most powerful methods for studying the graphite intercalation process because the shapes and intensities of the CESR signal both of nonintercalated and intercalated regions of graphite plate vary strongly during the intercalation. However, because of the difficulty to conduct reproducible experiments only a few CESR studies of the graphite intercalation process have been undertaken [4][5][6][7][8][9]. But even in these cases, due to the presence of a skin-effect the interpretation of changes in the graphite CESR signal during the intercalation process comes across greater difficulties.…”

Section: Introductionmentioning

confidence: 99%

In situ conduction ESR and theoretical studies of graphite intercalation by nitric acid

Зиатдинов

¹

,

Skrylnik

²

2000

Appl. Magn. Reson.

1

0

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Results of an in situ conduction electron-spin resonance (CESR) study of HNO3 molecule intercalation into highly oriented pyrolytic graphite (HOPG) plate with width being comparable with the graphite skin-depth governed by the c-axis conductivity are presented. The changes in the graphite CESR signal line shape, intensity and linewidth and the stepwise changes both of intensity and linewidth of CESR signal of intercalated sample were clearly detected during this reaction. Under the assumption that the graphite CESR signal evolution is caused by the advance of a boundary separating the intercalated and nonintercalated HOPG, the average value of spin reorientation probability during the collision of current carriers with this interface and the diffusion coefficient of nitric acid into the HOPG plate were extracted from experimental data. With the chemical potential versus intercalation time proposed by the authors for the experimental conditions, the stepwise changes of the CESR signal intensity of intercalated sample was calculated theoretically.

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“…Therefore, assuming the probability of spin reorientation of graphite current carriers during such collisions to be non-zero, the increase of the total rate of spin relaxation of graphite current carriers (the graphite CESR linewidth) with the time of intercalation can be observed. Note, that in all previous ESR experiments on graphite intercalation [4][5][6][7][8][9] which were carried out on HOPG plates with l ) d c , no broadening of the graphite CESR signal was observed. This indirectly supports our interpretation of the graphite CESR signal broadening at the intercalation of the narrow (l % 2d c ) HOPG plate.…”

Section: Discussionmentioning

confidence: 99%

Diffusion and Intercalation of Nitric Acid into Highly Oriented Pyrolytic Graphite: An in situ Conduction ESR Study

Зиатдинов

¹

,

Kainara

²

,

Krivoshei

³

2000

phys. stat. sol. (a)

View full text Add to dashboard Cite

Results of an in situ conduction ESR (CESR) study of HNO 3 molecule intercalation into narrow highly oriented pyrolytic graphite (HOPG) slabs are presented. The changes in the graphite CESR signal line shape, intensity and linewidth and the step-wise changes both of intensity and linewidth of the CESR signal from the intercalated sample have been clearly detected during this reaction. Under the assumption that the graphite CESR signal evolution is caused by the advance of a boundary separating the intercalated and non-intercalated HOPG, the constant of two-dimensional diffusion of nitric acid molecules into HOPG and the average value of the spin reorientation probability during the collision of current carriers with this interface have been extracted from the experimental data.

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Diffusion and intercalation of fluorine into highly oriented pyrolytic graphite: Anin situESR study

Cited by 19 publications

References 11 publications

Diffusion and Intercalation of Nitric Acid into Highly Oriented Pyrolytic Graphite: An in situ Conduction ESR Study

Diffusion and Intercalation of Nitric Acid into Highly Oriented Pyrolytic Graphite: An in situ Conduction ESR Study

In situ conduction ESR and theoretical studies of graphite intercalation by nitric acid

Diffusion and Intercalation of Nitric Acid into Highly Oriented Pyrolytic Graphite: An in situ Conduction ESR Study

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