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Keynote Lecture

WEB Expanding the compositional and microstructural space of transition metal-based carbides as 3D and 2D functional materials

Wednesday (01.01.2020)
00:30 - 01:00
Part of:


Transition metal-based carbides that belong to the family of MAX phases are an intriguing class of materials – particularly in terms of their mechanical properties – as they combine characteristics of metals and ceramics. More recently, some of their members have also been discussed in terms of their magnetic behavior, whereas most studies are conducted on thin film samples and the synthesis of bulk materials with later transition metals (e.g. Mn) is still a real challenge. Besides, MAX phases are used as precursors for a relatively new class of 2D materials, the so-called MXenes that are investigated in the context of a plethora of potential applications, for example in catalysis, battery and biomedical research.

Our group utilizes a diverse set of synthesis techniques to prepare new MAX phases as well as known ones with unique morphologies. In this talk, I will focus on the following two examples: (i) The synthesis of MAX phase Cr2GaC by an initially wet chemical approach that allows a new type of processability of the soluble precursors. (ii) Design of a “smart” hybrid MXene with switchable conductivity and temperature as an external stimulus. We employ X-ray powder diffraction and electron microscopy techniques to study the structure and microstructure of the products, respectively. In the case of the wet chemical-based synthesis of Cr2GaC, we conducted detailed thermal analysis to propose a formation mechanism of the MAX phase particles.

 

Speaker:
Prof. Christina Birkel
Arizona State University
Additional Authors:
  • Jan Paul Siebert
    Arizona State University
  • Minh Hai Tran
    Technische Universität Darmstadt
  • Robert Brilmayer
    Technische Universität Darmstadt
  • Prof. Dr. Leopoldo Molina-Luna
    Technische Universität Darmstadt
  • Prof. Dr. Annette Andrieu-Brunsen
    Technische Universität Darmstadt