By Erich H. Kisi

ISBN-10: 0198515944

ISBN-13: 9780198515944

This can be the 1st booklet protecting the idea, practicalities, and the vast functions of neutron powder diffraction in fabrics technological know-how, physics, chemistry, mineralogy and engineering. quite a few spotlight functions of neutron powder diffraction are defined within the advent, then the speculation is constructed and instrumentation defined adequate for a go back to the purposes. The booklet covers using neutron powder diffraction within the answer (hard) and refinement (more hassle-free) of crystal and magnetic buildings, functions of powder diffraction in quantitative part research, extraction of microstructural details from powder diffraction styles, and the purposes of neutron diffraction in reviews of elastic houses and for the dimension of residual pressure. extra conception to underpin those a variety of purposes is built as required. a lot of the fabric might be available to senior undergraduates in technological know-how and engineering, in addition to to graduate scholars and extra senior researchers with an curiosity within the strategy.

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Extra info for Applications of Neutron Powder Diffraction (Oxford Series on Neutron Scattering in Condensed Matter)

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However, because of the increasing use of single crystal diffraction in crystallographic studies, along with a shift in emphasis to areas such as inelastic scattering, for a time neutron powder diffraction and its applications languished. The renaissance of neutron powder diffraction can be traced to the development of computer power to support computer-based techniques for data analysis, most notably the Rietveld method (Rietveld 1967, 1969). Here the intensities of the diffraction peaks are calculated for a model crystal (and magnetic) structure; next these peaks are located at angles determined by neutron wavelength and lattice parameters; and finally the intensities distributed according to assumptions about widths and shapes of diffraction peaks and how these vary across the pattern.

G. Kittel 1976). In such a perfect crystal, if it were of infinite extent, the structure would be the same when viewed from any origin chosen within the bounds of the crystal. In other words, the position and identity of each atom is known from a relatively small sample. Over the past 90 years, crystallographers have devised powerful methods for describing crystal structures in the most efficient way. We begin with the periodicity of the structure. This periodicity may be conveniently represented by a three-dimensional space lattice as illustrated in Fig.

In a small fraction of cases this is not true and the superlattice is said to be incommensurate (or out of step) with the base structure. The shorthand description of the structure through an exactly specified unit cell is inadequate. The approach that is usually taken is to describe the position of the incommensurate atom(s) as a set of fractional coordinates (x, y, z) plus a vector describing the perturbation from the commensurate position (δx , δy , δz ). The perturbation may have one, two, or three nonzero elements leading to one-, two-, or three-dimensional incommensurate structures.

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Applications of Neutron Powder Diffraction (Oxford Series on Neutron Scattering in Condensed Matter) by Erich H. Kisi

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