Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/54505
Title: Hafnium-Silicon Precipitate Structure Determination in a New Heat-Resistant Ferritic Alloy by Precession Electron Diffraction Techniques
Author: Viladot, Désirée
Portillo i Serra, Joaquim
Gemí, Mauro
Nicolopoulos, Stavros
Llorca i Isern, Núria
Keywords: Microscòpia electrònica de transmissió
Estructura cristal·lina (Sòlids)
Tomografia
Nanotecnologia
Transmission electron microscopy
Layer structure (Solids)
Tomography
Nanotechnology
Issue Date: 2014
Publisher: Cambridge University Press
Abstract: The structure determination of an HfSi4 precipitate has been carried out by a combination of two precession electron diffraction techniques: high precession angle, 2.2°, single pattern collection at eight different zone axes and low precession angle, 0.5°, serial collection of patterns obtained by increasing tilts of 1°. A three-dimensional reconstruction of the associated reciprocal space shows an orthorhombic unit cell with parameters a = 11.4 Å, b = 11.8 Å, c = 14.6 Å, and an extinction condition of (hkl) h + k odd. The merged intensities from the high angle precession patterns have been symmetry tested for possible space groups (SG) fulfilling this condition and a best symmetrization residual found at 18% for SG 65 Cmmm. Use of the SIR2011 direct methods program allowed solving the structure with a structure residual of 18%. The precipitate objects of this study were reproducibly found in a newly implemented alloy, designed according to molecular orbital theory.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1017/S1431927613013627
It is part of: Microscopy and Microanalysis, 2014, vol. 20, num. 1, p. 25-32
Related resource: http://dx.doi.org/10.1017/S1431927613013627
URI: http://hdl.handle.net/2445/54505
ISSN: 1431-9276
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

Files in This Item:
File Description SizeFormat 
629439.pdf747.39 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.