Combining ECCI and FIB milling techniques to prepare site-specific TEM samples for crystal defect analysis of deformed minerals at high pressure - 09/05/19
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Abstract |
Dislocation microstructures in experimentally deformed single-crystal pyrope-rich garnet, (Mg,Fe)3(Al,Cr)3Si3O12, and polycrystalline forsterite, Mg2SiO4, were investigated by using electron channeling contrast imaging (ECCI) and transmission electron microscopy (TEM) combined with a focused ion beam (FIB)-microsampling. In the orientation-optimized ECCI method, we successfully observed individual dislocations across subgrain boundaries in a low-atomic-number mineral, pyrope-rich garnet (averaged Z-numbers, AZs∼10). Dislocations in a deformed forsterite (iron-free olivine) were also visible in the ECCI. In the ECCI on the single-crystal garnet, deformation bands consisting of dislocations, unusual contrasts in stripes and inhomogeneous distributions of sub-micrometer-sized pores were found. Further site-specific TEM observation on the deformation band revealed a high density of partial dislocations and stacking fault ribbons. The site-specific characterizations from ECCI to TEM, with assistance of FIB, can provide a new approach to investigate dislocation microstructures of deformed materials at high pressure and high temperature.
Le texte complet de cet article est disponible en PDF.Keywords : Electron channeling contrast imaging (ECCI), Transmission electron microscopy (TEM), Focused ion beam (FIB)-microsampling, Dislocation, Garnet, Forsterite
Plan
Vol 351 - N° 2-3
P. 295-301 - février 2019 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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