Anhydrous Phase B: Transmission Electron Microscope Characterization and Elastic Properties

Ahmed Addad 1 Philippe Carrez 1 Patrick Cordier 1 Damien Jacob 1 S.-I. Karato 2 A. Mohiuddin 2 Alexandre Mussi 1 Billy-Clitton Nzogang 1 Pascal Roussel 3 A. Tommasi
1 UMET - Unité Matériaux et Transformations - UMR 8207
2 Department of Geology and Geophysics [New Haven]
3 UCCS - Unité de Catalyse et de Chimie du Solide - UMR 8181
Abstract : We have performed an extensive characterization by transmission electron microscopy (including precession electron diffraction tomography and ab initio electron diffraction refinement as well as electron energy loss spectroscopy) of anhydrous phase B (Anh‐B) formed directly from olivine at 14 GPa, 1400 °C. We show that Anh‐B, which can be considered as a superstructure of olivine, exhibits strong topotactic relationships with it. This lowers the interfacial energy between the two phases and the energy barrier for nucleation of Anh‐B, which can form as a metastable phase. We have calculated the elastic and seismic properties of Anh‐B. From the elastic point of view, Anh‐B appears to be more isotropic than olivine. Anh‐B displays only a moderate seismic anisotropy quite similar to the one of wadsleyite.
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Ahmed Addad, Philippe Carrez, Patrick Cordier, Damien Jacob, S.-I. Karato, et al.. Anhydrous Phase B: Transmission Electron Microscope Characterization and Elastic Properties. Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2019, 20 (8), pp.4059-4072. ⟨10.1029/2019gc008429⟩. ⟨hal-02310376⟩

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