We have recently developed a new chemical reaction cell for in situ studies on JEEP: the Oxford-Diamond In Situ Cell (ODISC). It has a number of important features that help us to simulate reaction laboratory conditions, whilst simultaneously allowing us to probe our reacting mixture with the X-ray beam. The furnace, shown below, heats samples to temperatures above 1000°C and can incorporate a range of sample vessels required to study a broad spectrum of solid-state chemistries.