Research: Nitrides under High Pressures

Nitrides under High Pressures

Binary transition-metal nitrides and their phases with oxygen and carbon are important systems in geology and meteorology. This opens the question on formation of compounds and phase transitions since such phases have high impact in materials science and engineering as hard materials. A cooperation with PD Dr. U. Schwarz at the Max Planck Institute for Chemical Physics of Solids in Dresden as part of the DFG-Priority Program SPP1236 studies such systems in-situ as well as ex-situ under high pressures. The obtained samples will be studied for their mechanical properties within further cooperations. Own contributions are concerned with the preparation and characterization of precursor materials and nitrogen/oxygen sources for the high pressure experiments. A further cooperation with the group of Prof. Richard Dronskowski (Chair of Solid State and Quantum Chemistry, RWTH Aachen University) supports the investigations with quantum-chemical calculations.

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On applications of high-pressure high temperature conditions ζ-Fe2N transforms to ε-Fe3N1.5 (crystal structures). On exclusive application of pressure, the zeta-type order is conserved (diffracton patterns).