Electron Crystallography: Novel Approaches for Structure Determination of Nanosized Materials

ISBN-13: 9781402039195 / Angielski / Miękka / 2006 / 536 str.

Thomas E. Weirich; Janos L. Labar; Xiaodong Zou

Opis

During the last decade we have been witness to several exciting achievements in electron crystallography. This includes structural and charge density studies on organic molecules complicated inorganic and metallic materials in the amorphous, nano-, meso- and quasi-crystalline state and also development of new software, tailor-made for the special needs of electron crystallography. Moreover, these developments have been accompanied by a now available new generation of computer controlled electron microscopes equipped with high-coherent field-emission sources, cryo-specimen holders, ultra-fast CCD cameras, imaging plates, energy filters and even correctors for electron optical distortions. Thus, a fast and semi-automatic data acquisition from small sample areas, similar to what we today know from imaging plates diffraction systems in X-ray crystallography, can be envisioned for the very near future. This progress clearly shows that the contribution of electron crystallography is quite unique, as it enables to reveal the intimate structure of samples with high accuracy but on much smaller samples than have ever been investigated by X-ray diffraction. As a tribute to these tremendous recent achievements, this NATO Advanced Study Institute was devoted to the novel approaches of electron crystallography for structure determination of nanosized materials.

Spis treści

List of Contributors, Lectures,A. Introduction.A.1.What is electron crystallography; X.D. Zou.- A.2 Exploiting sub-Ångstrom abilities What advantages do different techniques offer? C. Kisielowski.- A.3 The way forward for electron crystallography; J.C.H. Spence.- A.4 Symmetry and structure M. Hargittai, I. Hargittai.- B. Experimental techniques. B.1 Introduction to electron diffraction; J.P. Morniroli.- B.2 Symmetry determination by electron diffraction; J.P. Morniroli.- B.3 Electron diffraction structure analysis Specimens and their electron diffraction patterns; V. Klechkovskaya .- B.4 Quantitative electron diffraction structure analysis Theory and practise of determing the electrostatic potential and chemical bonding in crystals; A.S. Avilov.- B.5 Quantification of texture patterns; P. Oleynikov et al.- B.6 Quantitative Convergent Beam electron diffraction Measurements of lattice parameters and crystal charge density; J.M. Zuo.- B.7 New instrumentation for TEM electron diffraction structure analysis: Electron diffractometry combined with beam precession; S. Nicolopoulos et al.- B.8 Role of electron powder diffraction in solving structures; J.L. Lábár .- B.9 Gas-phase electron diffraction for molecular structure determination; I. Hargittai.- B.10 Phase identification by combining local composition from EDX with information from diffraction database; J. L. Lábár.- B.11 Analysis of local structure, chemistry and bonding by electron energy loss spectroscopy; J. Mayer.- C. Crystal structure determination from electron microscopy data. C.1 From Fourier series towards crystal structures A survey of conventional methods for solving the phase problem; T.E. Weirich.- C.2 Crystal structure determination by image deconvolution and resolution enhancement; H. Jiang et al.- C.3 Structure determination from HREM by crystallographic image processing; X.D. Zou, S. Hovmöller.- C.4 3D reconstruction of inorganic crystals Theory and application; X.D. Zou, S.Hovmöller.- C.5 Solving and refining crystal structures from electron diffraction data; C.J. Gilmore, A. Stewart.- C.6 The maximum entropy method of solving crystal structures from electron diffraction data; C.J. Gilmore.- C.7 Structure refinement by taking dynamical diffraction into account Multi-slice least-squares refinement; J. Jansen.- C.8 TrueImage: A software package for focal-series reconstruction in HRTEM; C. Kübel, A. Thust.- D.Applications. D.1 New insights into the nanoworld of functional materials; G. Cox et al.-, D.2 Electron crystallography on polymorphs; U. Kolb, T. Gorelik.- D.3 Electron crystallography in mineralogy and materials science; D. Nihtianova et al.- D.4 Structures of zeolites and mesoporous crystals determined by electron diffraction and high-resolution electron microscopy; O. Terasaki.- D.5 HRTEM investigations of nanocrystalline materials; A.M. Tonejc.- D.6 Electron crystallography on beam sensitive materials Electron microscopy and electron diffraction of polymers; M. Tsuji.- D.7 Characterisation of catalysts by transmission electron microscopy; D. Wang.- E. Extended abstracts. E.1 Structural investigations of cold worked iron based alloys after nitriding; L. Demchenko et al.-, E.2 Structural refinement of nanocrystalline TiO2 samples; I. Djerdj et al.- E.3 Relation between magnetic properties and the structure of iron-based amorphous alloys determined by electron diffraction; O.V. Hryhoryeva.- E.4 Selected issues in quantitative structure analysis of nanocrystalline alloys; D. M. Kepatsoglou, et al.- E.5 Charge ordering and tilt modulation in multiferroic fluorides with TTB structure by electron diffraction and single crystal XRD; E. Montanari et al.- E.6 Electron diffraction by distorted nanocrystals Application of the eikonal representation; M.B. Shevchenko et al.- E.7 Electron microscopy investigations of glassy-like carbon; T.G. Shumilova et al.- E.8 Image deconvolution on crystals with interfaces; C.Y. Tang, F.H.