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Scanning electron microscope studies of local variations in cathodoluminescence in striated ZnS platelets

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Abstract

The local variations in cathodoluminescence (CL) observed in structurally complex ZnS platelets, arise from structural changes, impurity segregation and internal electrical field effects. By determining local crystal structures using birefringence, the position of the peak of the “edge” (conduction to valence band) CL band was calibrated. This could then be used to determine local crystal structures with the spatial resolution of the SEM. The variation of the peak position of certain impurity bands was determined by this means as a function of crystal structure. Finally by using faulted and unfaulted regions, the effect of the intense local electric fields, due to faulting, in quenching CL (i.e. decreasing emitted intensities) was observed. The importance of correcting the raw emission spectral data for the varying response of the detection system is emphasized. Emission band heights, positions and shapes are markedly altered. Only the corrected CL emission spectra are reliable for analytical work. Spectra in “arbitrary units” and both panchromatic and monochromatic CL micrographs can be misleading.

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Author notes

  1. B. G. Yacobi

    Present address: Department of Physics, University of Waterloo, N2L 3G1, Ontario, Canada

Authors and Affiliations

  1. Department of Metallurgy and Materials Science, Imperial College of Science and Technology, London, UK

    S. Datta, B. G. Yacobi & D. B. Holt

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  1. S. Datta
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  2. B. G. Yacobi
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  3. D. B. Holt
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Datta, S., Yacobi, B.G. & Holt, D.B. Scanning electron microscope studies of local variations in cathodoluminescence in striated ZnS platelets. J Mater Sci 12, 2411–2420 (1977). https://doi.org/10.1007/BF00553927

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  • DOI: https://doi.org/10.1007/BF00553927

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