Lattice Dynamics Ofice and a Case of Diffuse X-ray Scattering PDF Download
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Author: E. Forslind
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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Book Description
Author: E. Forslind
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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Book Description
Author: E. Forslind
Publisher:
ISBN:
Category : Ice
Languages : en
Pages : 54
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Author: David Carrick Sutherland
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ruqing Xu
Publisher:
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Category :
Languages : en
Pages :
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Book Description
X-ray scattering by lattice thermal vibrations give rise to thermal diffuse scattering (TDS). TDS contain valuable information about lattice dynamics of the scattering material. Historically, x-ray TDS was the first tool utilized by people in experimental determination of phonon dispersion relations. With the advent of synchrotron radiation technology, it has reemerged as an efficient probe for phonon studies in the recent decade. The scattering can be described with a semi-classical theory, and is often decomposed into first-order and high-order processes. First-order TDS, with a simple theoretical formula, is usually the dominating component and often used as an approximation to the total intensity. However, rigorous evaluation of high-order scattering has never been truly performed in the past, due largely to the apparent mathematical complexity of its expression. An algorithm aimed at resolving this difficulty is developed by the author, and proves to be successful. As a tool of phonon study, TDS was applied to the system of gallium-stabilized delta-plutonium. This material shows curious features in its phonon dispersion relation at room temperature; one of them was conjectured to exhibit further changes when temperature is lowered towards a structural phase transition at ~ 170 K. A TDS experiment was carried out to verify this prediction, yet analysis of the data showed that it was incorrect. In another major project, a new experimental approach was proposed to allow extraction of phonon dispersion information from measured TDS data without relying on any presumed force-constant models, which were required in previous TDS works and pose a limit to the method0́9s accuracy. The new approach determines frequencies of specific phonon modes based on the temperature-dependence of TDS intensities. A benchmark test of the approach on copper yielded excellent agreement with known phonon dispersion data.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 512
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Author: Peter Anthonie Kroon
Publisher:
ISBN:
Category :
Languages : en
Pages : 324
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Author: Peter Anthonie Kroon
Publisher:
ISBN:
Category : Lattice dynamics
Languages : en
Pages : 148
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 608
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Author: University of Chicago. Cloud Physics Laboratory
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Category : Cloud physics
Languages : en
Pages : 268
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Author: Thomas Richard Welberry
Publisher: OUP Oxford
ISBN: 0191523763
Category : Science
Languages : en
Pages : 281
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Book Description
Diffuse X-ray scattering is a rich (virtually untapped) source of local structural information over and above that obtained by conventional crystal structure determination (crystallography). The main aim in the book is to show how computer simulation of a model crystal provides a general method by which diffuse scattering of all kinds and from all types of materials can be interpreted and analysed. Part I of the book gives a description of the experimental methods used to obtain diffuse scattering data. Part II describes a number of simple stochastic models of disorder, which allows various concepts to be established and enables simple examples to be generated to illustrate key principles. Part III describes example studies of a wide variety of real materials. These examples not only document the development of computer simulation methods for investigating and analysing disorder problems but also provide a resource for helping future researchers recognise the kinds of effects which can occur and for pointing the way to tackling new problems which are encountered.
