Papers by Keyword: X-Ray Powder Diffraction

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Authors: R.A. Pires, I. Abrahams, Teresa G. Nunes, G.E. Hawkes
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Authors: E.J. MacLean, H.F.F. Millington, A.A. Neild, C.C. Tang
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Authors: Andrew N. Fitch
Abstract: The highly-collimated, intense X-rays produced by a synchrotron radiation source can be harnessed to build high-resolution powder diffraction instruments with a wide variety of applications. The general advantages of using synchrotron radiation for powder diffraction are discussed and illustrated with reference to the structural characterisation of crystalline materials, atomic PDF analysis, in-situ and high-throughput studies where the structure is evolving between successive scans, and the measurement of residual strain in engineering components.
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Authors: Jindrich Melichar, Vit Černý, Jan Fleischhacker, Rostislav Drochytka
Abstract: Aerated concrete is lightweight building material with excellent thermos-technical properties compared to its strengths, easy workability and economic efficiency. It is material with long tradition of manufacturing since 1924 but its potential is yet possible to be extended. Since the beginning pure ingredients such as lime and silica sand has been used. Nowadays we are looking for ways to replace these expensive raw materials with cheaper alternatives. One of the most important mechanical properties of each material is its strength. In case of aerated concrete the bearer of strength is mineral tobermorite. It is created by reaction of silicon oxides and lime at hydrothermal conditions. It belongs to the group of calcium hydrosilicates with chemical formula Ca5Si6O16(OH)2·4H2O. Main goal of this paper is proposal for modification of the raw materials composition and autoclave regime of aerated concrete using aluminium hydroxide in order to improve final mechanical properties and mineralogical composition.
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Authors: O. Greis, R. Ziel, D.E. García, N. Claussen, Bernd Breidenstein, A. Haase
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Authors: De Gui Li, Liu Qing Liang, Ming Qin, Lei Hu, Chang Sheng Qin, Shu Hui Liu, Bin He, Chen Zhong Jia, Ling Min Zeng
Abstract: A new Al-Cu-Nd system alloy, the high-purity Al2Cu3Nd ternary compound, was developed and prepared with the stoichiometric amounts of elemental constituents by arc melting under argon atmosphere. The X-ray diffraction (XRD) data of Al2Cu3Nd was collected by using the Rigaku Smart Lab X-ray powder diffractometer, and all X-ray diffraction peaks of Al2Cu3Nd compound were indexed successfully with the hexagonal structure. The Rietveld refinement results of the XRD pattern for the Al2Cu3Nd compound showed that the Al2Cu3Nd compound is the hexagonal structure, space group P6/mmm (No.191) with a = 5.2397(1) Å, c = 4.1783(1) Å, V = 99.34 Å3, Z = 1. The density of the compound was 6.501 g/cm3, and its reference intensity ratio (RIR) w 1.26.
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