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X-ray micro Laue diffraction tomography analysis of a solid oxide fuel cell.

Ferreira Sanchez D, Villanova J, Laurencin J, Micha JS, Montani A, Gergaud P, Bleuet P - J Appl Crystallogr (2015)

Bottom Line: For this purpose, a multiphase solid oxide fuel cell (SOFC) electrode composite made of yttria-stabilized zirconia and nickel oxide phases, with grains of about a few micrometres in size, has been analyzed.The SOFC and germanium Laue diffraction pattern analyses are compared and discussed.The development and application of an original geometrical approach to analyze the SOFC Laue data allowed the authors to resolve grains with sizes of about 3 µm and to identify their individual Laue patterns; by indexing those Laue patterns, the crystalline phases and orientations of most of the grains identified through the geometrical approach could be resolved.

View Article: PubMed Central - HTML - PubMed

Affiliation: Université Grenoble Alpes , Grenoble, F-38000, France ; CEA/LETI , MINATEC Campus, Grenoble, F-38054, France.

ABSTRACT

The relevance of micro Laue diffraction tomography (µ-LT) to investigate heterogeneous polycrystalline materials has been studied. For this purpose, a multiphase solid oxide fuel cell (SOFC) electrode composite made of yttria-stabilized zirconia and nickel oxide phases, with grains of about a few micrometres in size, has been analyzed. In order to calibrate the Laue data and to test the technique's sensitivity limits, a monocrystalline germanium sample of about 8 × 4 µm in cross-section size has also been studied through µ-LT. The SOFC and germanium Laue diffraction pattern analyses are compared and discussed. The indexing procedure has been successfully applied for the analysis of the germanium Laue data, and the depth-resolved two-dimensional cartographies of the full deviatoric strain tensor components were obtained. The development and application of an original geometrical approach to analyze the SOFC Laue data allowed the authors to resolve grains with sizes of about 3 µm and to identify their individual Laue patterns; by indexing those Laue patterns, the crystalline phases and orientations of most of the grains identified through the geometrical approach could be resolved.

No MeSH data available.


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The two-dimensional map distributions of the (a) Ge fluorescence intensities, (b) Ge diffracted intensities and (c) Ge equivalent deviatoric strain. (d) A comparison between the equivalent deviatoric strain and fluorescence profiles in the same region of the sample, which is indicated by the green lines in (a) and (c). In detail (e), an X-ray nanotomography absorption contrast image of the analyzed Ge layer.
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fig2: The two-dimensional map distributions of the (a) Ge fluorescence intensities, (b) Ge diffracted intensities and (c) Ge equivalent deviatoric strain. (d) A comparison between the equivalent deviatoric strain and fluorescence profiles in the same region of the sample, which is indicated by the green lines in (a) and (c). In detail (e), an X-ray nanotomography absorption contrast image of the analyzed Ge layer.

Mentions: The sum of the intensities of all the diffracted Ge spots was calculated for each respective Laue image, and the Ge fluorescence intensities were collected at each sample position. With those intensities, origrams were constructed. These are analogous to the sinograms obtained from absorption contrast tomography (Hofmann et al., 2012 ▶). As described by Sanchez et al. (2014 ▶), with these calculated origrams the simultaneous inverse Radon transform (SIRT) algorithm can be applied to recover the Ge crystalline phase and Ge chemical–elemental depth-resolved two-dimensional distribution, as shown in Figs. 2 ▶(a) and 2 ▶(b), respectively.


X-ray micro Laue diffraction tomography analysis of a solid oxide fuel cell.

Ferreira Sanchez D, Villanova J, Laurencin J, Micha JS, Montani A, Gergaud P, Bleuet P - J Appl Crystallogr (2015)

The two-dimensional map distributions of the (a) Ge fluorescence intensities, (b) Ge diffracted intensities and (c) Ge equivalent deviatoric strain. (d) A comparison between the equivalent deviatoric strain and fluorescence profiles in the same region of the sample, which is indicated by the green lines in (a) and (c). In detail (e), an X-ray nanotomography absorption contrast image of the analyzed Ge layer.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4379434&req=5

fig2: The two-dimensional map distributions of the (a) Ge fluorescence intensities, (b) Ge diffracted intensities and (c) Ge equivalent deviatoric strain. (d) A comparison between the equivalent deviatoric strain and fluorescence profiles in the same region of the sample, which is indicated by the green lines in (a) and (c). In detail (e), an X-ray nanotomography absorption contrast image of the analyzed Ge layer.
Mentions: The sum of the intensities of all the diffracted Ge spots was calculated for each respective Laue image, and the Ge fluorescence intensities were collected at each sample position. With those intensities, origrams were constructed. These are analogous to the sinograms obtained from absorption contrast tomography (Hofmann et al., 2012 ▶). As described by Sanchez et al. (2014 ▶), with these calculated origrams the simultaneous inverse Radon transform (SIRT) algorithm can be applied to recover the Ge crystalline phase and Ge chemical–elemental depth-resolved two-dimensional distribution, as shown in Figs. 2 ▶(a) and 2 ▶(b), respectively.

Bottom Line: For this purpose, a multiphase solid oxide fuel cell (SOFC) electrode composite made of yttria-stabilized zirconia and nickel oxide phases, with grains of about a few micrometres in size, has been analyzed.The SOFC and germanium Laue diffraction pattern analyses are compared and discussed.The development and application of an original geometrical approach to analyze the SOFC Laue data allowed the authors to resolve grains with sizes of about 3 µm and to identify their individual Laue patterns; by indexing those Laue patterns, the crystalline phases and orientations of most of the grains identified through the geometrical approach could be resolved.

View Article: PubMed Central - HTML - PubMed

Affiliation: Université Grenoble Alpes , Grenoble, F-38000, France ; CEA/LETI , MINATEC Campus, Grenoble, F-38054, France.

ABSTRACT

The relevance of micro Laue diffraction tomography (µ-LT) to investigate heterogeneous polycrystalline materials has been studied. For this purpose, a multiphase solid oxide fuel cell (SOFC) electrode composite made of yttria-stabilized zirconia and nickel oxide phases, with grains of about a few micrometres in size, has been analyzed. In order to calibrate the Laue data and to test the technique's sensitivity limits, a monocrystalline germanium sample of about 8 × 4 µm in cross-section size has also been studied through µ-LT. The SOFC and germanium Laue diffraction pattern analyses are compared and discussed. The indexing procedure has been successfully applied for the analysis of the germanium Laue data, and the depth-resolved two-dimensional cartographies of the full deviatoric strain tensor components were obtained. The development and application of an original geometrical approach to analyze the SOFC Laue data allowed the authors to resolve grains with sizes of about 3 µm and to identify their individual Laue patterns; by indexing those Laue patterns, the crystalline phases and orientations of most of the grains identified through the geometrical approach could be resolved.

No MeSH data available.


Related in: MedlinePlus