The Plutonium Carbon Phase Diagram.
After all these years, I realized I didn't have this one in my collection, but it popped up in my Google Scholar Alert for "Liquid Plutonium."
It actually comes from a Ph.D. thesis published some 13 years ago, this one: High temperature phase transitions in nuclear fuels of the fourth generation.
It probably came up in my Google Scholar Alert because of the publication of this book:
Nuclear Fuel Cycle
This phase diagram is so interesting that I immediately sent it to my son; it suggests some very cool peritectic reactions. It's not really what I expected, and I'm surprised I never looked for it.
It strikes me as the sort of thing that could save a world.
The only plutonium carbon phase diagram I have in my files up to now, is the ternary system, Pu/Tc/C that I came across while searching for the binary Tc Pu system, which I never found, actually.
This is the ternary Tc C Pu Phase Diagram:
