Sites are Separable in Garnets with ALCHEMI |
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Authors: | János L Lábár Jerzy Morgiel Lajos Tóth István Dódony |
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Institution: | Research Institute for Technical Physics and Materials Science, Budapest, Hungary, HU Institute of Metallurgy and Materials Science, Krakow, Poland, PL E?tv?s Lóránd University, Budapest, Hungary, HU
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Abstract: | It is shown in this paper that – in contrast to the accepted belief in the literature – it is possible to determine if a
minority component is located on the dodecahedral, octahedral or tetrahedral sites in a garnet single crystal. Previous literature
regarded the dodecahedral sites indistinguishable form the tetrahedral sites. Our prediction about the separability is based
upon dynamical Bloch-wave calculations and proved experimentally in a transmission electron microscope (TEM) on two different
natural garnets (almandine and grossular). The crystallographic positions of the minority components are determined in an
ALCHEMI experiment that makes use of the channeling of electrons in special directions of a single-crystal sample. |
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Keywords: | : Crystallographic site separation TEM ALCHEMI channeling garnet |
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