How do specimen preparation and crystal perfection affect structure factor measurements by QCBED?

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Marco E. Ciriotti
Messaggi: 23469
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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How do specimen preparation and crystal perfection affect structure factor measurements by QCBED?

Messaggio da Marco E. Ciriotti » gio 30 mar, 2017 16:43

Referenza:
▪ Peng, D. & Nakashima, P.N.H. (2017): How do specimen preparation and crystal perfection affect structure factor measurements by quantitative convergent‐beam electron diffraction? Journal of Applied Crystallography, 50, (in press).

Abstract:
The effectiveness of tripod polishing and crushing as methods of mechanically preparing transmission electron microscopy specimens of hard brittle inorganic crystalline materials is investigated via the example of cerium hexaboride (CeB6). It is shown that tripod polishing produces very large electron-transparent regions of very high crystal perfection compared to the more rapid technique of crushing, which produces crystallites with a high density of imperfections and significant mosaicity in the case studied here where the main crystallite facets are not along the natural {001} cleavage planes of CeB6. The role of specimen quality in limiting the accuracy of structure factor measurements by quantitative convergent-beam electron diffraction (QCBED) is investigated. It is found that the bonding component of structure factors refined from CBED patterns obtained from crushed and tripod-polished specimens varies very significantly. It is shown that tripod-polished specimens yield CBED patterns of much greater integrity than crushed specimens and that the mismatch error that remains in QCBED pattern matching of data from tripod-polished specimens is essentially nonsystematic in nature. This stands in contrast to QCBED using crushed specimens and lends much greater confidence to the accuracy and precision of bonding measurements by QCBED from tripod-polished specimens.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 23469
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: How do specimen preparation and crystal perfection affect structure factor measurements by QCBED?

Messaggio da Marco E. Ciriotti » lun 03 apr, 2017 13:55

Pubblicazione effettuata.

Referenza:
▪ Peng, D. & Nakashima, P.N.H. (2017): How do specimen preparation and crystal perfection affect structure factor measurements by quantitative convergent‐beam electron diffraction? Journal of Applied Crystallography, 50, 602-611.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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