Topic
Electron backscatter diffraction
About: Electron backscatter diffraction is a research topic. Over the lifetime, 15184 publications have been published within this topic receiving 317847 citations. The topic is also known as: EBSD.
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TL;DR: In this paper, powder diffraction data for semiconductor and metallic states of vanadium dioxide are presented, and the structures are refined by Rietveld methods using a monoclinic cell (a = 5.7529A, b = 4.5263A, c =5.3825A, β = 122.61°) and space group P21/c for the room temperature data, and a tetragonal cell(a =4.5540A,c = 2.8557A) for data collected at 400 K.
Abstract: Powder diffraction data for semiconductor and metallic states of vanadium dioxide are presented. The structures are refined by Rietveld methods using a monoclinic cell (a = 5.7529A, b = 4.5263A, c = 5.3825A, β = 122.61°) and space group P21/c for the room temperature data, and a tetragonal cell (a =4.5540A, c = 2.8557A) and space group P42/mnm for data collected at 400 K. The similarity between the corresponding X-ray diffraction patterns is discussed. The transition process from the monoclinic to tetragonal phase is investigated and initial evidence for the coexistence of phases over a small temperature range is presented.
109 citations
TL;DR: In this paper, a dissolution of micro-sized ZnO powder from aqueous ammonium hydrogen carbonate solution in the presence of thiourea, followed by calcination at 400°C for 1 h.
Abstract: ZnO nanostructures have been successfully prepared by dissolution–reprecipitation of micro-sized ZnO powder from aqueous ammonium hydrogencarbonate solution in the presence of thiourea, followed by calcination at 400°C for 1 h. The products were characterized by simultaneous thermal analysis, x-ray diffraction, scanning electron microscopy, transmission electron microscopy, selected-area electron diffraction, and Fourier-transform infrared spectroscopy analysis. The results reveal that the morphology and particle size of the as-prepared ZnO samples are susceptible to the amount of added thiourea. The developed method has potential for application in industry due to simple processing and inexpensive reagents.
108 citations
TL;DR: In this article, the usual methods of crystal structure determination are curtailed or omitted, since they involve more geometrical than optical discussion, once the reduced intensities are taken as known.
Abstract: THE numerous books on the diffraction of X-rays by crystals all treat the subject with the view of introducing the reader to the methods for determining crystal structures. It is true that some presentation of the theory of optical interference cannot be omitted and that the various books go into this theory to varying degrees. But it is only v. Laue's recent book* which makes the optical theory of X-ray interference in crystals its main aim. In it, the usual methods of crystal structure determination are curtailed or omitted, since they involve more geometrical than optical discussion, once the reduced intensities are taken as known. Omitted as well is the description of experimental methods, as the emphasis of the book is on theory.
108 citations
TL;DR: In this article, the microstructural development of an alumina scale formed on a model FeCrAlY alloy during oxidation at 1200 °C was characterized for up to 2000 hours of growth.
Abstract: The microstructural development of an alumina scale formed on a model FeCrAlY alloy during oxidation at 1200 °C was characterized for up to 2000 hours of growth. Quantitative scanning electron microscopy (SEM) studies revealed that the scale had a columnar microstructure, with the grain size being a linear function of the distance from the scale/gas interface. For a given fixed distance from the scale/gas interface, there was found to be no change in the oxide grain size for exposure times ranging from 24 to 2000 hours at 1200 °C, up to 100 hours at 1250 °C. Thus, there was no significant coarsening of existing grains in the scale. Through oxygen tracer experiments, the scale-growth mechanism was shown to be predominated by inward oxygen diffusion along the oxide grain boundaries. Electron backscatter diffraction (EBSD) analysis further revealed that a competitive oxide-grain growth mechanism operates at the scale/alloy interface, which is manifested by a preferential crystallographic grain orientation. The scale-thickening kinetics were modeled using the experimentally-derived, microstructural parameters and were found to be in excellent agreement with converted thermogravimetric (TG) measurements. The model predicted a subparabolic oxidation rate, with the time exponent decreasing with increasing exposure time. The values of the time exponent were shown to be approximately 0.35 to 0.37, at oxidation times commonly reached in the TG experiments, i.e., a few tens of hours. At longer oxidation times of a few thousand hours and with a constant rate of average oxide-grain size increase, the time exponent was predicted to approach 0.33, corresponding to an ideal cubic oxidation rate.
108 citations
TL;DR: In this article, a formulation of the problem of low-energy electron diffraction from crystal surfaces is given using multiple scattering theory, which can be applied to model surfaces of arbitrary complexity, provided they are regular.
Abstract: A formulation of the problem of low-energy electron diffraction from crystal surfaces is given using multiple scattering theory. Only elastic processes are considered. The resultant formulae are straightforward to compute and can be applied to model surfaces of arbitrary complexity, provided they are regular.
108 citations