SPEAKER_02 says the lab encourages mixed crystal precursors to react, often by raising temperature, leading atoms to form a new crystal.

“raise the temperature or do something else to encourage them to react and then atoms start reacting and they form into this new crystal and this shows up in the XRD pattern because usually if the geometry of the atoms change drastically the XRD pattern changes a lot but what really happens in like a typical practical materials discovery campaign is when you first try something it doesn't work and the outcome isn't just like a clear yes or no but it's usually like a very mixed”