ELNES fingerprint of Al coordination in nesosilicates

Hansen, P.L.; McComb, David W.; Brydson, R.

doi:10.1016/0739-6260(92)90122-t

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…We have employed this technique to determine the local aluminium environment in cement systems via measurement and modelling of the A1 K-ELNES. In principle such information may also be derived from analysis of the A1 L2, 3-ELNES [4].…”

Section: Fig 1 Typical Transmission Electron Micrograph Ofop C-s-h mentioning

confidence: 99%

Determining the local coordination of aluminium in cement using electron energy loss near-edge structure

1994

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Abstract. The local site symmetry of aluminium in Al-substituted calcium silicate hydrate phases, similar to those found in hardened Portland cement pastes, has been determined by experimental measurement and theoretical modelling of the electron energy loss near-edge structure associated with the aluminium K-edge measured using parallel electron energy loss spectroscopy in the transmission electron microscope. Changes in the local aluminium environment were observed between different regions of the microstructure which are explained in terms of aluminium substitution into both tetrahedral silicon and octahedral magnesium sites. This spatially-resolved information is in excellent agreement with 27A1 and 298i magic angle spinning nuclear magnetic resonance data on bulk samples as well as the predictions based upon compositional trends derived from the results of energy dispersive X-ray and electron energy loss elemental microanalysis. In a wider context we wish to stress the complementarity of both spatially-resolved and bulk spectroscopic techniques, which possess differing degrees of sensitivity, in the analysis of materials science samples.

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Section: Fig 1 Typical Transmission Electron Micrograph Ofop C-s-h mentioning

confidence: 99%

Determining the local coordination of aluminium in cement using electron energy loss near-edge structure

1994

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“…Fortunately, it is well known that the nearest neighbours of the element (coordination) that gives rise to an ionization edge determine its near-edge fine structure (ELNES) [26,27]: Therefore, the L23 or K edges exhibit typical edge shapes (fingerprints) e.g. for Al [27,28] or Si [27,29] in octahedral or tetrahedral coordination with oxygen atoms. To apply the MLS-fit to oxides and silicates, we only have to use oxide standards with elements of identical coordination.…”

Section: Intensity Determination -mentioning

confidence: 99%

Quantitative microanalysis using electron energy-loss spectrometry. I. Li and Be in oxides

Hofer

Kothleitner

1993

Microsc. Microanal. Microstruct.

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Abstract. 2014 Electron energy-loss spectrometry enables the detection of Li and Be via the K ionization edges. However, the detection and quantification of these low energy edges present several problems, like low edge-to-background ratios, problems with background extrapolations, overlapping of edges and multiple scattering in case of thicker specimens. All these problems can be overcome by careful application of well known procedures: Spectra have to be recorded from very thin specimen regions (t/03BB 0.5) and subsequently deconvoluted by the Fourier-log-method. This procedure improves the background in front of the edges, so that the conventional A . E-r model can be used for background fitting without problems. The Li and Be K edges overlap with other edges e.g. the L23 edges of elements Mg to P and the M23 edges of the elements Ca to Cu. In such a situation quantitative analysis is only possible by a multiple-least-square fit with reference spectra and if experimentally determined partial cross-sections are used. The successful application of these methods is demonstrated for inorganic materials like phenacite, beryl, spodumene, Be-phosphate and Li-Cr-oxide. The quantification and detection limits for Li and Be in typical material science specimens are discussed.

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Inner-Shell Ionization

Hofer¹

1995

Springer Series in Optical Sciences

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ELNES fingerprint of Al coordination in nesosilicates

Cited by 8 publications

References 4 publications

Determining the local coordination of aluminium in cement using electron energy loss near-edge structure

Determining the local coordination of aluminium in cement using electron energy loss near-edge structure

Quantitative microanalysis using electron energy-loss spectrometry. I. Li and Be in oxides

Inner-Shell Ionization

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