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Author:
Publisher:
ISBN:
Category : Deuterides
Languages : en
Pages : 9
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Book Description
Author:
Publisher:
ISBN:
Category : Deuterides
Languages : en
Pages : 9
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Book Description
Author: Erich H. Kisi
Publisher: OUP Oxford
ISBN: 0191545406
Category : Science
Languages : en
Pages : 504
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Book Description
This is the first book covering the theory, practicalities, and the extensive applications of neutron powder diffraction in materials science, physics, chemistry, mineralogy and engineering. Various highlight applications of neutron powder diffraction are outlined in the introduction, then the theory is developed and instrumentation described sufficient for a return to the applications. The book covers the use of neutron powder diffraction in the solution (hard) and refinement (more straightforward) of crystal and magnetic structures, applications of powder diffraction in quantitative phase analysis, extraction of microstructural information from powder diffraction patterns, and the applications of neutron diffraction in studies of elastic properties and for the measurement of residual stress. Additional theory to underpin these various applications is developed as required. Much of the material should be accessible to senior undergraduates in science and engineering, as well as to graduate students and more senior researchers with an interest in the technique.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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When Na-deficient NaxCoO2 is intercalated with water1 or heavy water2, it becomes a superconductor. The maximum critical temperature of 4.5 K is found for the composition NaxCoO2yD2O (x= 0.3 and y=1.4). In spite of its low transition temperature, several similarities with high temperature superconducting cuprates have raised interest in this compound. Nevertheless, up to now, a clear understanding of the role of water has not been achieved. Since superconductivity appears only when water is inserted in the parent compound, the goal of this research work was to understand what kind of effect water intercalation has in terms of electron conduction and superconductivity. Neutron scattering played a crucial role in this study because of its ability to determine the accurate positions of light elements such as hydrogen or deuterium. We have focused our attention on the intra-molecular range of D2O, studying the structural changes that take place within the (heavy) water molecules themselves. In order to do this the distance correlations D-D, D-O, and O-O have been studied. Powder neutron diffraction data of the deuterated sodium cobaltate have been analyzed using the Pair Density Function (PDF) technique, which gives information about the local structure of the water molecules. The peaks of the PDF of the neutron diffraction data, in fact, give directly in real space the distances between pair of atoms, in this case the distances D-D, D-O, and O-O. If a peak shifts to a lower (or higher) value of r (Å) it means that the bond between that particular pair of atoms has become shorter (or longer). In this way it was possible to determine any change in the geometry of the water molecules. The results obtained show that the D-D distance and the D-O-D angle in Na0.35C0O21.4D2O are significantly different from those of ordinary water (D2O). Two coexisting distributions of possible D-O-D bond angles are observed. We speculate that the altered geometry of the intercalated water molecules is due to a modification of the dynamics of the hydrogen bond. In this case, water may be embedded in an electronically active environment and indirectly participate in electronic conduction.
Author: George Edward Bacon
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 164
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Book Description
Author: Chick C Wilson
Publisher: World Scientific Publishing Company
ISBN: 9813105402
Category : Technology & Engineering
Languages : en
Pages : 386
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Book Description
This important book presents a comprehensive account of the techniques and applications of single crystal neutron diffraction in the area of chemical crystallography and molecular structure. Beginning with a brief description of the general principles and the reasons for choosing the technique — the “why” — the book covers the methods for both the production of neutrons and the measurement of their scattering by molecular crystals — the “how” — followed by a detailed survey of past, present and future applications — the “what”. The coverage of both steady state and pulsed neutron sources and instrumentation is extensive, while the survey of applications is the most comprehensive yet undertaken. The book endeavours to show why the technique is an essential method for studying areas as diverse as hydrogen bonding and weak interactions, organometallics, supramolecular chemistry and crystal engineering, metal hydrides, charge density and pharmaceuticals. It is an ideal reference source for the research worker interested in using neutron diffraction to study the structure of molecules.
Author: Erich H. Kisi
Publisher: Oxford University Press
ISBN: 0199657424
Category : Science
Languages : en
Pages : 509
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Book Description
This is the first book covering the theory, practicalities, and the extensive applications of neutron powder diffraction in materials science, physics, chemistry, mineralogy, and engineering. The broad coverage should be accessible to graduate students and senior undergraduates in science and engineering, as well as lecturers and researchers.
Author: M.T. Hutchings
Publisher: CRC Press
ISBN: 1134389809
Category : Science
Languages : en
Pages : 420
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Book Description
Over the past 25 years the field of neutron diffraction for residual stress characterization has grown tremendously, and has matured from the stage of trial demonstrations to provide a practical tool with widespread applications in materials science and engineering. While the literature on the subject has grown commensurately, it has also remained
Author: Lawrence M. Brown
Publisher:
ISBN:
Category : Deuterium
Languages : en
Pages : 82
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Book Description
Author: Albert Furrer
Publisher: World Scientific Publishing Company
ISBN: 9813102500
Category :
Languages : en
Pages : 316
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Book Description
Neutron scattering has become a key technique for investigating the properties of materials on an atomic scale. The uniqueness of this method is based on the fact that the wavelength and energy of thermal neutrons ideally match interatomic distances and excitation energies in condensed matter, and thus neutron scattering is able to directly examine the static and dynamic properties of the material. In addition, neutrons carry a magnetic moment, which makes them a unique probe for detecting magnetic phenomena. In this important book, an introduction to the basic principles and instrumental aspects of neutron scattering is provided, and the most important phenomena and materials properties in condensed matter physics are described and exemplified by typical neutron scattering experiments, with emphasis on explaining how the relevant information can be extracted from the measurements.
Author: U.S. Atomic Energy Commission
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 820
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Book Description
Consists of AECD 1-2023 (no. 1-1779 called MDDC).
