A Rietveld method is described which extracts information on crystal structure, texture and microstructure directly from two-dimensional synchrotron diffraction images. This is advantageous over conventional texture analysis that relies on individual diffraction peaks, particularly for low-symmetry materials with many overlapping peaks and images with a poor peak-to-background ratio. The method is applied to two mineralized biological samples with hydroxylapatite fabrics: an ossified pachycephalosaurid dinosaur tendon and an Atlantic salmon scale. Both are measured using monochromatic synchrotron X-rays. The dinosaur tendon has very strongly oriented crystals with c-axes parallel to the tendon direction. The salmon scale displays a weak texture.
Texture analysis from synchrotron images with the Rietveld method: dinosaur tendon and salmon scale / Lonardelli, Ivan; H., Wenk; Lutterotti, Luca; M., Goodwin. - In: JOURNAL OF SYNCHROTRON RADIATION. - ISSN 0909-0495. - STAMPA. - 12:3(2005), pp. 354-360. [10.1107/S090904950500138X]
Texture analysis from synchrotron images with the Rietveld method: dinosaur tendon and salmon scale
Lonardelli, Ivan;Lutterotti, Luca;
2005-01-01
Abstract
A Rietveld method is described which extracts information on crystal structure, texture and microstructure directly from two-dimensional synchrotron diffraction images. This is advantageous over conventional texture analysis that relies on individual diffraction peaks, particularly for low-symmetry materials with many overlapping peaks and images with a poor peak-to-background ratio. The method is applied to two mineralized biological samples with hydroxylapatite fabrics: an ossified pachycephalosaurid dinosaur tendon and an Atlantic salmon scale. Both are measured using monochromatic synchrotron X-rays. The dinosaur tendon has very strongly oriented crystals with c-axes parallel to the tendon direction. The salmon scale displays a weak texture.File | Dimensione | Formato | |
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