AC Kolloquium - Dr. Simon D. Kloß (LMU München)

"Highly Oxidized Transition Metal Nitrides"⠀

Researching transition metal nitrides is complicated by the tendency of nitride ions convert into molecular nitrogen by oxidation at elevated temperatures. Classical solid-state chemical synthesis methods, which work at normal pressure, quickly reach their limits when it comes to producing highly oxidised and nitrogen-rich systems. These highly oxidised materials can now be produced by high-pressure synthesis, where pressures in the gigapascal range (10⁹ Pa) generate high chemical nitrogen potentials. We were thus able to stabilise highly oxidised nitridometallates such as the Ca₄FeN₄ with Fe^IV, as well as to gain access to the new class of nitride perovskites exem-plified by LaReN₃. Since we use large-volume presses, we obtain larger sample quantities that are suitable for the determination of physical properties such as magnetism, magnetic structure, and electrical conductivity.