Read e-book online Advances in Structure Research by Diffraction Methods. PDF

By W. Hoppe, R. Mason

ISBN-10: 0080172873

ISBN-13: 9780080172873

Advances in constitution study via Diffraction equipment: quantity five offers discussions on program of diffraction tools in constitution learn. The booklet presents the facets of constitution examine utilizing a number of diffraction equipment. The textual content includes 2 chapters. bankruptcy 1 studies the overall conception and experimental tools utilized in the learn of all kinds of amorphous reliable, by way of either X-ray and neutron diffraction, and the precise bibliography of labor on inorganic glasses. the second one bankruptcy discusses electron diffraction, one of many significant tools of deciding upon the constructions of molecules within the fuel section. Chemists and molecular physicists will locate the e-book a superb resource of data.

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Additional resources for Advances in Structure Research by Diffraction Methods. Fortschritte der Strukturforschung mit Beugungsmethoden

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If it can be assumed that the rest of the structure is unaffected, any changes must be due to M-M and M-X interactions. This assumption is likely to be very much better in the case of samples where it is possible to exchange ions at temperatures well below the glass transition region. For example the Na"*" ions in Na2 0-CaO-Si02 glass are partially replaced by Ag* on treatment with molten AgNOa at 2 5 0 - 3 0 0 °C [ 2 9 4 , 2 9 5 ] . The Structure of Amorphous Solids by X-Ray and Neutron Diffraction 61 6.

The subject of multiple scattering in X-ray studies of amorphous solids is discussed by several authors [113, 118, 119, 120]. Warren andMozzi [118] give tables from which the ratio l2(Qo)/Ii (Qo) can be calculated. 08. Similar tables including effects due to absorption have been pubUshed by Dwiggins [119, 120] for both reflection and transmission geometry. 3 Hoppe/Mason V Α. C. 0375 sin^d) (MR)']. 4) Similar conditions occur for X-rays, with elements of low atomic number and a high incident energy, and under these conditions there is much to recommend the adoption of the same geometry, especially if the apparatus includes a diffracted beam crystal monochromator.

The structure of vitreous B2O3 has however been the subject of considerable debate and various proposals are summarised in a review by Krogh'Moe [233]. Physical models of vitreous silica have been constructed in several laboratories [234, 235, 236, 237, 238, 239, 240] and used to predict a number of properties including the radial distribution function [236, 238, 239, 240, 241], vibrational spectra [242, 243, 244, 245], and configurational entropy [246]. The function Qoi(Qo) can be calculated for such a model by means of a modified version of the Debye equation, which for X-rays may be written [42] Qoix(Qo) = Ñ^ Z X f p ( Q o ) f a ( Q o ) ^ ^ ^ ^ - Q o i 2 ( Q o ) .

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Advances in Structure Research by Diffraction Methods. Fortschritte der Strukturforschung mit Beugungsmethoden by W. Hoppe, R. Mason


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