Missions

The person recruited will take part in a of the French project “D-CLIC” within the investment program “France 2030” to innovate in terms of radioactive waste management in deep geological disposal. The D-CLIC project focuses more particularly on the fate of three long-lived radionuclides, namely 14C, 36Cl and 129I, characterized by a high mobility in the environment. The objective is thus to confine them efficiently in a matrix with high chemical durability (i.e. presenting a low level of alteration by interaction with dissemination vectors such as water). To achieve this goal, it is proposed to design calcium phosphate –based materials with an apatitic structure. Indeed, apatites are a class of minerals with remarkable durability properties and their structural flexibility makes it possible to consider both an isolated or joint incorporation of each of the targeted elements. The aim of this project is to compare two synthetis routes for the production of phosphocalcic apatites intended to incorporate iodate, chloride and/or carbonate anions: a ceramic route (co-precipitation followed by sintering at low temperature) and a cementation route (in which the solution containing the anions to be insolubilized will constitute the mixing solution).

Activités

The goal of the post-doc is to study in depth the crystallochemistry of substituted apatites, as a function of the elaboration conditions, concentrations of anions and proposed combinations. In the case of apatites obtained by the ceramic route, the aim is also to study their thermal stability in order to assess their resistance to sintering. The post-doctoral student will write publications produced by this research and communicate her/his results at conferences.

Compétences

PhD in Material Sciences, Solid Chemistry
Solid background in crystallography, powder XRD & Rietveld method
Experience in vibrational spectroscopies and NMR

Contexte de travail

The candidate will work at Laboratoire des Solides Irradiés (a joint unit of CEA, CNRS and Ecole polytechnique), located on the Polytechnic School campus, at just 20 Km South of Paris. The post-doctoral student will join the D2SM team (Defects, Disorder and Structuring Matter) and will work in close collaboration with the XRD plateform “DIFFRAX” of Polytechnique School and the colleagues of SOLEIL synchrotron for the analyses by vibrational spectroscopies (Raman and IR). The project will interact closely with the other teams of the project (CEA, CIRIMAT-Toulouse and ICB-Dijon).

Contraintes et risques

no specific risk