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Nanolamellar MAX phases : from the synthesis of single crystals towards the fabrication of new two-dimensional compounds

Mardi 24 juin 2014 14:00 - Duree : 1 heure
Lieu : LMGP salle de séminaires - 2nd étage

Orateur : Pr. Thierry Ouisse LMGP (CNRS / Grenoble INP) - Equipe Cristallogenèse

Abstract : The ternary compounds known as MAX phases form a family of nano-lamellar carbides and nitrides [1]. Their name comes from their general formula Mn+1AXn, where M is a transition metal, A belongs to groups 12-16, X is either carbon or nitrogen and the integer n ranges from 1 to 3. Those materials combine some interesting properties of ceramics to that of metals, and are expected to play a major role in applications requiring high resistance to oxidation and to thermal and mechanical shocks. Their high anisotropy and their specific nano-lamellar structure also make them interesting candidates for forming new kinds of ultra-thin conducting layers [2]. Those carbides and nitrides might thus open the way to the development of a new family of graphene-like compounds, named MXenes by their inventors [2]. After a general presentation of the properties of the MAX phases, I shall focus on synthesis aspects. The standard processes usually result in the production of highly polycrystalline samples which lack the anisotropy expected from single crystals, and prohibit their use for producing large area MXenes. I shall present the process of high temperature solution growth developed at LMGP for producing bulk single crystals [3-4]. Eventually, I shall describe some structural and physical properties of those crystals as well as their ability to be used for producing two-dimensional layers. more info

Discipline évènement : (Physique)
Entité organisatrice : (LMGP)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire LMGP)
Site de l'évènement : Site Minatec

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