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Digitale Medien

HREM imaging of small Pt clusters dispersed in Y-zeolites (1990)

Pan, M. ; Cowley, J. M. ; Chan, I. Y.

Springer

Catalysis letters 5 (1990), S. 1-11

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ISSN: 1572-879X

Schlagwort(e): HREM ; small Pt clusters ; zeolites

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract High resolution electron microscopy (HREM) has been used to study dispersed Pt clusters in NaY- and USY-zeolites. All the samples contained 0.8% Pt and were reduced at temperatures of 300 ° C, 500 ° C and 650 ° C. The size of the Pt clusters ranged from a few å up to ∼ 30 å. When the incident electron beam was sufficiently strong, it caused some of the extremely small metal clusters to sinter. This was usually accompanied by zeolite damage. This in-situ sintering must be taken into consideration when interpreting the particle size distribution results obtained solely by TEM, especially for particles that are smaller than 10 å. The minimum phase contrast imaging condition is demonstrated to be more appropriate than optimum defocus for detecting the extremely small Pt clusters inside the zeolite structures.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00772087

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Digitale Medien

A simplified mode of differential phase contrast lorentz microscopy (1993)

Kraut, S. ; Cowley, J. M.

New York, NY [u.a.] : Wiley-Blackwell

Microscopy Research and Technique 25 (1993), S. 341-345

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ISSN: 1059-910X

Schlagwort(e): Magnetic domains ; Thin films ; Iron ; Cobalt ; Scanning transmission electron microscopy ; Annular detector ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Allgemeine Naturwissenschaft

Notizen: A simplified mode of differential phase contrast Lorentz microscopy for the study of magnetic domain structures in thin films is proposed and demonstrated. This mode employs a single annular detector in a scanning transmission electron microscope rather than the specialized split detectors that have been previously used. The resulting signal is sufficiently linear with magnetic field strength to allow quantitative data to be obtained on the domain configurations and the natures of the domain walls. © 1993 Wiley-Liss, Inc.

Zusätzliches Material: 4 Ill.