Download PDF by Erich H. Kisi: Applications of neutron powder diffraction

By Erich H. Kisi

ISBN-10: 0198515944

ISBN-13: 9780198515944

This is often the 1st e-book overlaying the idea, practicalities, and the broad purposes of neutron powder diffraction in fabrics technological know-how, physics, chemistry, mineralogy and engineering. a variety of spotlight functions of neutron powder diffraction are defined within the advent, then the idea is built and instrumentation defined enough for a go back to the functions. The booklet covers using neutron powder diffraction within the resolution (hard) and refinement (more uncomplicated) of crystal and magnetic buildings, functions of powder diffraction in quantitative part research, extraction of microstructural details from powder diffraction styles, and the functions of neutron diffraction in reviews of elastic houses and for the size of residual pressure. extra conception to underpin those numerous functions is built as required. a lot of the fabric may be obtainable to senior undergraduates in technological know-how and engineering, in addition to to graduate scholars and extra senior researchers with an curiosity within the procedure.

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Extra info for Applications of neutron powder diffraction

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1951a). The first and perhaps still most significant application of neutron powder diffraction to the magnetic interaction was the detection of antiferromagnetism and the elucidation of the magnetic structure of MnO (Shull and Smart 1949; Shull et al. 1951a). The Mn2+ ion has five unpaired electrons in 3d orbitals (spin S = 5/2) and a correspondingly large magnetic moment (5µB ). At room temperature, the atomic moments in paramagnetic MnO are randomly oriented and the magnetic scattering contributes only very broad features to the neutron diffraction pattern.

Disentangling the individual contributions to a complex powder diffraction pattern is one of the supreme challenges of the field and also most rewarding in the richness of the information that it can provide. 4, expanded in Chapter 4 and applied to real materials and problems in the succeeding chapters. First, however, we pause to examine several of the less well-ordered states of condensed matter in progressively greater departures from three-dimensional crystalline perfection. 3 Lower and higher dimensional forms of order – the loss of lattice periodicity This section encompasses several very different types of order that have in common the fact that the translational periodicity of the lattice is broken in one, two, or three 34 Theory – the bare essentials dimensions, for some or all of the basis atoms whilst preserving a high degree of symmetry.

The structure of condensed matter 37 The major one of interest to neutron scattering is the magnetic moment possessed by some atoms. Just as the atoms interact by physical and chemical means to form highly ordered crystal structures, so too can the magnetic moments interact to form magnetic structures, albeit through more subtle mechanisms. The kinds of magnetic order that are possible parallel the kinds of structural order already discussed; however, additional complexity is possible because (i) the magnetic moment is a vector and (ii) the magnetic structure is superimposed on the crystal structure.

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Applications of neutron powder diffraction by Erich H. Kisi

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