Crystallography

Read e-book online Applications of neutron powder diffraction PDF

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By Erich H. Kisi

ISBN-10: 0198515944

ISBN-13: 9780198515944

This is often the 1st booklet masking the idea, practicalities, and the large functions of neutron powder diffraction in fabrics technology, physics, chemistry, mineralogy and engineering. a variety of spotlight functions of neutron powder diffraction are defined within the advent, then the idea is constructed and instrumentation defined enough for a go back to the functions. The publication covers using neutron powder diffraction within the answer (hard) and refinement (more ordinary) of crystal and magnetic buildings, purposes of powder diffraction in quantitative section research, extraction of microstructural details from powder diffraction styles, and the functions of neutron diffraction in experiences of elastic houses and for the dimension of residual rigidity. extra concept to underpin those quite a few purposes is built as required. a lot of the fabric might be obtainable to senior undergraduates in technology and engineering, in addition to to graduate scholars and extra senior researchers with an curiosity within the procedure.

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The discovery of superconductivity in (La,Ba)2 CuO4 , followed quickly by the discovery of the 90 K superconductor YBa2 Cu3 O7 , led to unprecedented interest in superconductivity, and intensely competitive efforts, largely with X-ray diffraction, to establish the crystal structure of the latter compound. The race to determine the structure was won by scientists using neutron powder diffraction because the relative neutron scattering length of oxygen is comparable to the scattering length of the metal ions.

12(a); however, these peaks are very broad in comparison to those for crystals, reflecting the high degree of disorder in the structure. 9 (number of nearest neighbours – from the area of the first peak) which closely approaches the value of 4 for crystalline diamond (Robertson 2002). g. SiO2 ) the situation is more complex as shown in Fig. 12(b). A pair-correlation function can be constructed for each chemical pair (Si–Si, Si–O, O–O). ). These tetrahedra are highly ordered and contain strong covalent bonds.

The focus in the early work was on crystal structure refinement (Chapter 5), that is, on extracting just those parameters that describe the crystal structure. It has been recognized subsequently that other parameters such as peak width, peak shape, scale factors, and peak positions also carry useful information (see Chapters 8, 9, and 11). A second reactor intended for neutron beam research, the High Flux Reactor (HFR) at the Institut Laue-Langevin (ILL), Grenoble, was being constructed at about the same time as the potential of the Rietveld method was being recognized.

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Applications of neutron powder diffraction by Erich H. Kisi


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