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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 |
URI: | http://hdl.handle.net/2445/54505 |
Related resource: | http://dx.doi.org/10.1017/S1431927613013627 |
ISSN: | 1431-9276 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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