Synthesis and crystal growth of i-QCs and ACs at high pressures

Research group: Ulrich Häussermann.

The recent discovery of an i-Al-Cu-Fe phase with an unusual composition in a meteorite fragment fueled our hypothesis that high pressure synthesis can be a novel route to stabilize i-QCs with new compositions and to explore phase relations between Bergman and Tsai i-QC families. We will perform exploratory investigations of binary and ternary systems using large volume multi-anvil high pressure equipment and cell assemblies allowing for melt-growth of (quasi) crystalline samples at pressures up to 15 GPa. Crystalline specimens will be isolated by melt-centrifugation of the recovered sample at ambient pressure.

The goal of this project line is the confirmation of the hypothesis that novel i-QCs will be accessible through high pressure synthesis and the subsequent identification and optimization of formation and crystal growth conditions for RE-containing i-QCs and ACs at high pressures. In situ diffraction studies at synchrotron facilities (such as the ESRF, Grenoble) are expected to be useful for rapid mapping of formation conditions of (quasi) crystalline samples.