Results

Feb 12, 2018 - Dislocations make fat plumes Results

In the last issue of Geophysical Research Letters, we examine the implications of pure climb creep on the morphology of plumes in the lower mantle

 

 

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)