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- W3036829884 abstract "Compounds with the crystal structure of the mineral spinel (MgAl 2 O 4 ) provide an interesting test case for the quantitative x-ray microanalysis of crystals. The cations occupy more than one crystallographic site, two thirds occupying the octahedral 16d interstices and one third occupying the tetrahedral 8a interstices of the oxygen anion sublattice (Fd3m). Under dynamical electron diffraction conditions in the AEM, the standing-wave electron intensity on the two sublattices may differ considerably, in turn yielding proportionally different x-ray count rates from the cations on these sublattices. This effect has been exploited to determine the sites of impurity atoms in spinels using the ALCHEMI technique. The strong crystal orientation effect obstructs the accurate determination of the composition of spinels using x-ray microanalysis, however. In the system NiO-TiO 2 , which is the subject of ongoing investigation, a second phase is always found finely dispersed within the metastable spinel phase. The AEM is the only instrument which provides the high spatial resolution necessary to probe the composition." @default.
- W3036829884 created "2020-06-25" @default.
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- W3036829884 date "1992-08-01" @default.
- W3036829884 modified "2023-10-06" @default.
- W3036829884 title "Crystal orientation effects in the x-ray microanalysis of spinels" @default.
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- W3036829884 doi "https://doi.org/10.1017/s0424820100130833" @default.
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