Results
Dec 15, 2017 - Twinning in post-perovskite Results
We publish in Scientific Reports an original study on the prediction of mechanical twinning in MgSiO3 post-perovskite, known to be an important constituent at the core mantle boundary. Being a few hundreds of kilometers thick, the D’’ layer located just oabove the core mantle boundary is characterized by an important seismic anisotropy. In this article, based on first-principles calculations, we demonstrate the occurrence of mechanical twinning in post-perovskite structure and predict the mechanical behavior of twin nucleation. As twinning involves changes in crystal orientation, such mechanism may potentially influence the development of crystal preferred orientations. The future incorporation of this twinning mechanism in seismic anisotropy model should lead to a novel understanding of the origin of seismic anisotropy at the core mantle boundary.
Sep 14, 2017 - Hardening mechanisms in olivine Results
In a paper which just appeared on line in Philosophical Magazine, Alexandre Mussi and co-workers present a new application of electron tomography of dislocations to olivine in order to clarify the complex microstructures and the source of hardening in single crystals deformed slightly above 1000°C.
Jun 6, 2017 - Dislocation modeling in olivine Results
Srinivasan Mahendran publishes his first paper on atomistic modelling of dislocations in olivine (Mg2SiO4)
May 25, 2017 - Continuous description of grain boundaries using crystal defect fields Results
European Journal of Mineralogy publishes a new article on continuum dislocation/generalized-disclination modelling of a MgO 310/[001] tilt boundary from X. Sun et al.