B02 – Combinatorial synthesis of thin film model systems

PI: Prof. Jochen. M. Schneider (Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, 52074 Aachen)

SFB researchers: Shamsa Aliramaji (Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, 52074 Aachen)

Former SFB researcher: Philipp Keuter (Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, 52074 Aachen)


The goal of this project is to investigate the causality between synthesis conditions, chemical composition, phase formation and morphology of intermetallic and solid solution Mg-Al-Ca thin films as well as composites thereof. To this end, binary and ternary Mg-based solid solution and complex intermetallic (Mg,Al)2Ca and Mg17Al12 thin films are synthesized combinatorically by high vacuum physical vapor deposition (PVD). Using this approach, thin films with composition gradients are obtained which allow for an efficient investigation of composition induced changes in phase and defect phase formation within the Mg-Al-Ca system. The as-grown thin films are characterized regarding phase formation by X-ray diffraction (XRD) and chemical composition by energy dispersive X-ray spectroscopy (EDX) along the composition gradient. Furthermore, the correlation between chemical composition, synthesis conditions and thin film morphology, studied by scanning transmission electron microscopy (STEM), are identified. With these model systems the effect of composition and morphology on the corrosive and mechanical behavior is studied efficiently and systematically. These data contribute to bulk material synthesis and to the compilation of defect phase diagrams.

Publications:

  • [1] Keuter, P.; Karimi Aghda; S.; Music, D.; Kümmerl; P.; Schneider, J.M. (2019) Synthesis of Intermetallic (Mg1-x,Alx)2Ca by Combinatorial Sputtering. Materials (Basel) (12) pp. 3026 – DOI:10.3390/ma12183026
  • [2] Aliramaji, A.; Keuter, P. ; Neuß D.; Hans M.; Primetzhofer, D.; Schneider, J.M. Effect of growth temperature and atmosphere exposure time on impurity incorporation in sputtered Mg, Al, and Ca thin films
  • [3] Aliramaji, A.; Keuter, P. ; Neuß D.; Hans M.; Primetzhofer, D.; Schneider, J.M. Reducing impurity incorporation in sputtered Mg, Al, and Ca thin films
  • [4] Keuter, P.; Schneider, J.M.; CALPHAD-assisted phase formation modelling in sputtered Mg-Ca thin films