Dipole Dynamics in the Endohedral Metallofullerene La@C82

Nuttall, Christopher J.; Hayashi, Yoichiro; Yamazaki, Kazuyoshi; Mitani, Tadaoki; Iwasa, Yoshihiro

doi:10.1002/1521-4095(20020219)14:4<293::aid-adma293>3.0.co;2-i

Cited by 36 publications

(31 citation statements)

References 27 publications

(9 reference statements)

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“…37,38 In the solid state, pure La@C 82 has a fcc structure at room temperatures. The C 82 cage with C 2v symmetry is highly disordered in high-symmetry lattice.…”

Section: 36mentioning

confidence: 99%

Carrier transport properties of nanocrystalline Er3N@C80

Sun

Maeda

Sezaimaru

et al. 2014

Journal of Applied Physics

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Electrical transport properties of the nanocrystalline Er 3 N@C 80 with fcc crystal structure were characterized by measuring both temperature-dependent d.c. conductance and a.c. impedance. The results showed that the Er 3 N@C 80 sample has characteristics of n-type semiconductor and an electron affinity larger than work function of gold metal. The Er 3 N@C 80 /Au interface has an ohmic contact behavior and the contact resistance was very small as compared with bulk resistance of the Er 3 N@C 80 sample. The charge carriers in the sample were thermally excited from various trapped levels and both acoustic phonon and ionic scatterings become a dominant process in different temperature regions, respectively. At temperatures below 250 K, the activation energy of the trapped carrier was estimated to be 35.5 meV, and the ionic scattering was a dominant mechanism. On the other hand, at temperatures above 350 K, the activation energy was reduced to 15.9 meV, and the acoustic phonon scattering was a dominant mechanism. In addition, a polarization effect from the charge carrier was observed at low frequencies below 2.0 MHz, and the relative intrinsic permittivity of the Er 3 N@C 80 nanocrystalline lattice was estimated to be 4.6 at frequency of 5.0 MHz.

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“…37,38 In the solid state, pure La@C 82 has a fcc structure at room temperatures. The C 82 cage with C 2v symmetry is highly disordered in high-symmetry lattice.…”

Section: 36mentioning

confidence: 99%

Carrier transport properties of nanocrystalline Er3N@C80

Sun

Maeda

Sezaimaru

et al. 2014

Journal of Applied Physics

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“…38) Experimentally, the dynamical motion of metal atoms has been reported for La@C 82 , Ce@C 82 , Sc 2 @C 84 , and La 2 @C 80 by a dielectric-constant measurements, high resolution transmission electron microscopy (HRTEM), X-ray absorption fine structure (XAFS) study, time-differential perturbed angular correlation (TDPAC) method, and MEM/Rietveld analysis. 27,[39][40][41][42][43] Contrary to an encapsulated Sc atom, which is tightly bound to the fullerene cage, an encapsulated La atom moves significantly in the fullerene cage above ca. 20 K.…”

Section: Structures and Dynamics Of Endohedral Metallofullerenesmentioning

confidence: 99%

Endohedral Metallofullerenes and Nano-Peapods

Kitaura

Shinohara

2007

jjap

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In this review article, we deal with the structures and properties of novel hybrid nanocarbon materials, which are created by the incorporation of atoms and molecules in hollow spaces of fullerenes and carbon nanotubes (CNTs); these hybrid materials are called endohedral metallofullerenes (in the case of metal atom incorporated fullerenes) and nano-peapods, respectively. Synthesis procedures, structural characterizations by synchrotron powder x-ray diffraction, electronic structures, and magnetic properties of endohedral metallofullerenes are discussed. The structure and properties of nano-peapods by high-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS), scanning tunneling microscopy (STM) and field effect transistor (FET) transport measurements together with their synthesis procedures are described. The utilization of the low-dimensional nanosized spaces of CNTs to produce novel low-dimensional nanocluster, nanowire and nano-tube materials is also discussed.

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“…Recently, it was found that M@C 82 is not metallic but semiconductorlike, regardless of the fact that odd numbers of electrons are transferred to the C 82 cage from the encapsulated metal atom. [5][6][7][8][9][10][11] However, the metallic behavior found in Rb 8.8͑7͒ C 84 can be explained by the simple band picture, as in the case of alkaline metal doped C 60 . 1 This indicates the possibility of materials design with higher fullerenes conducted by theoretical calculation.…”

Section: Resultsmentioning

confidence: 99%

“…The photoemission ͑UPS͒, 9 resistivity , 5,7,8 optical spectroscopy 10 and scanning tunneling spectroscopy ͑STS͒ ͑Ref. 11͒ showed a semiconductorlike behavior with small energy gap, E g , for M@C 82 where the valence of M is +3.…”

Section: -7mentioning

confidence: 99%

Metallic phase in the metal-intercalated higher fullereneRb8.8(7)C84

et al. 2005

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A new material of higher fullerene, Rb x C 84 , was synthesized by intercalating Rb metal into C 84 crystals. The Rb x C 84 crystals showed a simple cubic ͑sc͒ structure with lattice constant, a, of 16.82͑2͒ Å at 6.5 K, and 16.87͑2͒ Å at 295 K. The Rietveld refinements were achieved with the space group, Pa3, based on a model that the C 2 axis of D 2d -C 84 aligned along ͓111͔. The sample composition was determined to be Rb 8.8͑7͒ C 84 . The ESR spectrum at 303 K was composed of a broad peak with peak-to-peak linewidth ⌬H pp of 220 G, and a narrow peak with ⌬H pp of 24 G. Temperature dependence of the broad peak clearly showed a metallic behavior. The metallic behavior was discussed based on a theoretical calculation. This finding of new metallic phase in a higher fullerene is the first step for a development of new types of fullerene materials with novel physical properties such as superconductivity.

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Dipole Dynamics in the Endohedral Metallofullerene La@C82

Cited by 36 publications

References 27 publications

Carrier transport properties of nanocrystalline Er3N@C80

Carrier transport properties of nanocrystalline Er3N@C80

Endohedral Metallofullerenes and Nano-Peapods

Metallic phase in the metal-intercalated higher fullereneRb8.8(7)C84

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