A novel measurement cell allows, for the first time, soft and hard X-ray investigations under high pressures of up to 20 bar and temperatures of up to 400°C. This provides new insights into thermo ... The innovative measurement cell enables in-situ/operando X-ray absorption spectroscopy (XAS) measurements under high pressures and temperatures for the first time. The cell is suitable for use in both the soft and the tender/hard X-ray energy ranges ... [1756 chars]