Conversion of MAX phase single crystals in highly porous carbides by high temperature chlorination

Shiqui Zhang (1) , Lu Shi (1) , Florian Mercier (2) , O. Chaix-Pluchery (1) , D. Chaussende (1) , I. Gélard (1) , B. Hackens (3) , Thierry Ouisse (1)

1 LMGP - Laboratoire des matériaux et du génie physique
2 SIMaP - Science et Ingénierie des Matériaux et Procédés
3 IMCN - Institut de la matière condensée et des nanosciences / Institute of Condensed Matter and Nanosciences

We show that combining high temperature chlorination with the chemical sensitivity of the A-atom planes of single crystals of some nano-lamellar MAX phases allows one to synthesize highly porous and electrically conducting carbides. Focusing on the case of porous Cr 3 C 2 , we present the dependence of the layer morphology, structure and formation kinetics on processing parameters such as temperature and time. The determination of the Raman signature of Cr 3 C 2 and Cr 7 C 3 allows us to follow the creation and elimination of the various phases as a function of processing time. Electrical resistivity and magnetoresistance data versus temperature and magnetic field are also presented and analyzed.

Domaines: Matériaux

Shiqui Zhang, Lu Shi, Florian Mercier, O. Chaix-Pluchery, D. Chaussende, et al.. Conversion of MAX phase single crystals in highly porous carbides by high temperature chlorination. Ceramics International, 2017, 43 (11), pp.8246-8254. ⟨10.1016/j.ceramint.2017.03.153⟩. ⟨hal-01762237⟩