Papers by Keyword: X-Ray Diffraction (XRD)

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Authors: Gamra Tellouche, Khalid Hoummada, Dominique Mangelinck, Ivan Blum
Abstract: The phase formation sequence of Ni silicide for different thicknesses is studied by in situ X ray diffraction and differential scanning calorimetry measurements. The formation of a transient phase is observed during the formation of δ-Ni2Si; transient phases grow and disappear during the growth of another phase. A possible mechanism is proposed for the transient phase formation and consumption. It is applied to the growth and consumption of θ-Ni2Si. A good accordance is found between the proposed model and in situ measurement of the kinetics of phase formation obtained by x-ray diffraction and differential scanning calorimetry for higher thickness.
Authors: C.G.H. Walker, S.A. Morton, J.M. Charnock, E.J. MacLean, Norman M.D. Brown
Authors: M. Kurzawa, I. Rychlowska-Himmel, M. Bosacka, G. Dabrowska
Authors: A.M. Alam, R. Chieragatti, Bruno Lavelle
Authors: Frédéric Riffard, Henri Buscail, Eric Caudron, Régis Cueff, Christophe Issartel, S. El Messki, Sébastien Perrier
Authors: Mei Liu, Hai Hui Ruan, Liang Chi Zhang
Abstract: To meet different electrical or optical functionalities, thin films are often of multiple layers processed at high temperatures. Substantial residual stresses can therefore develop in such thin film systems due to the disparate thermal properties of the individual material layers. High stresses can lead to mechanical failure of the systems and thus understanding the residual stresses in thin film systems is important. This paper presents a systematic way to characterize the residual stresses in epitaxial, polycrystalline and amorphous layers by using X-ray diffraction (XRD) techniques. The single-point XRD pattern renders the stresses of crystalline layers and the scanning XRD gives the curvature of the whole film. Based on the newly-developed analytical model, the residual stresses of each layer can all be determined.
Authors: João Telésforo Nóbrega Medeiros, Luís Gallego Martinez, Roberto M. Souza, D.K. Tanaka
Authors: Elza Bontempi, Annalisa Zacco, Laura Borgese, Alessandra Gianoncelli, Rosario Ardesi, Laura E. Depero
Abstract: In the last years several projects have been developed for treatment of fly ash with the aim of their reuse. A final target of these researches is to evaluate the real performance of the new materials obtained by the treatment and the actual and, if the case, potential markets for the foreseen products. Indeed, the use of a recycled inert would reduce the consumption of natural resources and this is one of the main environmental EU target. Examples are clinkering, road asphaltation and some construction work where specific performances are requested. Moreover, the reuse of inerted fly ash will obtain a reduction of carbon dioxide produced by the necessary treatments of primary materials, as limestone in concrete production. At the University of Brescia (Italy) a new process, based on colloidal silica medium, has been developed to inertise fly ashes, containing heavy metals. This approach appears to be quite promising for industrial application in view of the easiness that can be foreseen in applying it to existing plants treating industrial fly ash. The obtained inert product is a powder, that can be employed as a filler in several application. In this work we present first results about characterization of this new powder material, that can be applied as a filler.
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