Application of Energy-Dispersive X-ray Elemental Mapping To Probe the Homogeneity of Sol-Gel Derived YBa2Cu3O7-.delta. and Related Phases

Houk, Carol S.; Burgoine, Gary A.; Page, Catherine J.

doi:10.1021/cm00052a008

Cited by 6 publications

(1 citation statement)

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“…This indicates that the filling ratio of nickel is very high. Elemental mapping analysis and compositional line profiles indicate the spatial distribution of different atomic species [10] and shed further light on the structural characteristics of Ninanowire-filled C 70 tubes. Carbon elemental mapping (Fig.…”

Section: F Tao Et Al/concentric Cables From Ni Nanowires and Fullermentioning

confidence: 90%

Concentric Sub‐micrometer‐Sized Cables Composed of Ni Nanowires and Sub‐micrometer‐Sized Fullerene Tubes

Tao

Liang

Yin

et al. 2007

Adv Funct Materials

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Highly ordered arrays of submicrometer‐sized coaxial cables composed of submicrometer‐sized C60 and C70 tubes filled with Ni nanowires are successfully prepared by combining a sol–gel method with an electrodeposition process. The wall thickness of the submicrometer‐sized tubes can be adjusted by the concentration of fullerenes and the immersion time. The thermal stability of the submicrometer‐sized C60 tubes is studied by Raman spectroscopy and it is found that these structures can be easily decomposed to form carbon nanotubes at relatively low temperatures (above 573 K) in an alumina template. These novel coaxial cable structures have been characterized by transmission electron microscopy (TEM), high‐resolution TEM (HRTEM), scanning electron microscopy (SEM), field‐emission SEM (FESEM), Raman spectroscopy, elemental mapping, energy dispersive X‐ray (EDX) spectroscopy, X‐ray diffraction (XRD), vibrating sample magnetometer (VSM) experiments, and superconducting quantum interference device (SQUID) measurements. Magnetic measurements show that these submicrometer‐sized cables exhibit enhanced ferromagnetic behavior as compared to bulk nickel. Moreover, submicrometer‐sized C70/Ni cables show uniaxial magnetic anisotropy with the easy magnetic axis being parallel to the long axis of the Ni nanowires. C70/Ni cables also exhibit a new magnetic transition at ca. 10 K in the magnetization–temperature (M–T) curve, which is not observed for the analogous C60/Ni structures. The origin of this transition is not yet clear, but might be related to interactions between the Ni nanowires and C70 molecules. There is no preferred magnetization axis in submicrometer‐sized C60/Ni cables, which implies that the Ni nanocrystals have different packing modes in the two composites. These different crystalline packing modes lead to different magnetic anisotropy in the two composites, although the Ni nanocrystals have the same face‐centered cubic (fcc) structure in both cases.

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Section: F Tao Et Al/concentric Cables From Ni Nanowires and Fullermentioning

confidence: 90%

Concentric Sub‐micrometer‐Sized Cables Composed of Ni Nanowires and Sub‐micrometer‐Sized Fullerene Tubes

Tao

Liang

Yin

et al. 2007

Adv Funct Materials

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Mapping the elemental distribution in sol‐gel derived ceramics

Houk

Page

1996

Advanced Materials

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Elemental dispersive x‐ray (EDX) composition distribution mapping using a scanning electron microscope (SEM) provides information about samples that is complementary to that obtained from X‐ray diffraction. Examples are given (e.g., Ba and Cu maps of YBa2Cu3O7 − δ, see figure) to demonstrate the usefulness of this technique in evaluating the homogeneity of sol‐gel products and in elucidating elemental zoning (see also cover picture). magnified image

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A new strontium-copper ethylene glycol complex: synthesis and structure of [Sr(C2H6O2)5][Cu(C2H4O2)2]·C2H6O2

Pico

Houk

Weakley

et al. 1997

Inorganica Chimica Acta

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Application of Energy-Dispersive X-ray Elemental Mapping To Probe the Homogeneity of Sol-Gel Derived YBa2Cu3O7-.delta. and Related Phases

Cited by 6 publications

References 1 publication

Concentric Sub‐micrometer‐Sized Cables Composed of Ni Nanowires and Sub‐micrometer‐Sized Fullerene Tubes

Concentric Sub‐micrometer‐Sized Cables Composed of Ni Nanowires and Sub‐micrometer‐Sized Fullerene Tubes

Mapping the elemental distribution in sol‐gel derived ceramics

A new strontium-copper ethylene glycol complex: synthesis and structure of [Sr(C2H6O2)5][Cu(C2H4O2)2]·C2H6O2

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