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Collecting 3D electron diffraction data by the rotation method
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
2010 (English)In: Zeitschrift fur Kristallographie, ISSN 0044-2968, Vol. 225, no 2-3, 94-102 p.Article in journal (Refereed) Published
Abstract [en]

A new method for collecting complete three-dimensional electron diffraction data is described. Diffraction data is collected by combining electron beam tilt at many very small steps, with rotation of the crystal in a few but large steps. A number of practical considerations are discussed, as well as advantages and disadvantages compared to other methods of collecting electron diffraction data.

Place, publisher, year, edition, pages
2010. Vol. 225, no 2-3, 94-102 p.
Keyword [en]
Electron diffraction, data collection, 3D diffraction data
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-31968DOI: 10.1524/zkri.2010.1202ISI: 000276505200007OAI: oai:DiVA.org:su-31968DiVA: diva2:279081
Available from: 2009-12-01 Created: 2009-12-01 Last updated: 2011-11-23Bibliographically approved
In thesis
1. 3D Electron crystallography: Real space reconstruction and reciprocal space tomography
Open this publication in new window or tab >>3D Electron crystallography: Real space reconstruction and reciprocal space tomography
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Electron crystallography is an important technique for studying micro- and nano-sized materials. It has two important advantages over X-ray crystallography for structural studies: 1) crystals millions of times smaller than those needed for X-ray diffraction can be studied; 2) it is possible to; focus the electrons to form an image. The local atomic arrangement can be seen directly by high-resolution transmission electron microscopy (HRTEM). The crystallographic structure factor phases, which are lost in recording diffraction patterns, are present in HRTEM images and can be determined experimentally. The main disadvantages of electron crystallography compared to X-ray diffraction are that the data are difficult to collect, often incomplete and suffer from dynamic scattering. New methods need to be developed to overcome these problems. In this work, structure determination of several unique and complex porous materials including zeolites and mesoporous silica is demonstrated. None of the structures of these materials could be solved by X-ray crystallography. New techniques are also developed in order to overcome the disadvantages of electron crystallography. The new techniques include a digital sampling method for collecting precession electron diffraction data and a rotation method for automatic collection of complete 3D electron diffraction data. A number of practical issues concerning data collection and data processing are described and the data quality is analysed.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2010. 72 p.
Keyword
Electron crystallography, Electron microscopy, Porous materials
National Category
Chemical Sciences
Research subject
Structural Chemistry
Identifiers
urn:nbn:se:su:diva-39034 (URN)978-91-7447-044-4 (ISBN)
Public defence
2010-06-08, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Submitted.Available from: 2010-05-17 Created: 2010-05-06 Last updated: 2010-05-14Bibliographically approved

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Zhang, DaliangOleynikov, PeterHovmöller, SvenZou, Xiaodong
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