We request 3 days on POLARIS to perform in situ, combined powder diffraction-gravimetric analysis on the formation and decomposition of three mixed lithium-potassium amides. Accessing the intrinsic hydrogen content within ammonia has the potential to play a significant role in sustainable energy storage applications. Inexpensive light-metal amides are among the most active ammonia decomposition catalysts and are likely to surpass the performance of transition metal based catalysts. Creating mixed metal amide systems is one way to tailor their function. The Li-K amide systems show great promise in this regard, promoting the decomposition of the system to the metal imide at significantly reduced temperatures. In situ diffraction data will help to unravel the complex decomposition mechanism observed in these species and thus inform the design of future metal amide and imide catalysts.