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A new method for thickness determination of single-crystal thin samples at exact zone axis orientation, based on pattern recognition in convergent beam electron diffraction (CBED), is presented. The method is especially well suited to materials with a large unit cell in zone axis directions where the reciprocal lattice is uniformly dense with diffraction points. The new method is based on comparison of a measured CBED zone axis pattern with a set of calculated ones. Its accuracy was estimated to be around 10% in the 5–100 nm thickness range as checked for garnets at the [111] zone orientation. 相似文献
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Balboni Roberto Frabboni Stefano Rinaldi Romano Spigarelli Sandra 《Mikrochimica acta》1994,114(1):187-194
Axial channelling effects in a pyrope garnet for three zone axis orientations: [111], [211], and [311] have been investigated. The variations of the characteristic X-ray emission under the [111] zone axis diffracting conditions was correlated with dynamical n-beam calculations. Site occupancies determinations obtained by comparing X + Z and Y sites have been made using ALCHEMI techniques. 相似文献
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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. 相似文献
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