Introduction. Ternary Systems: Remarks on the Actinide Alloying Behavior, Al-Fe-U, Al-O-Pu, Al-Si-U, C-Fe-Pu, C-Fe-U, C-Mo-U, C-Pd-Pu, C-Pd-Th, C-Pd-U, C-Pu-Rh, C-Pu-Ru, C-Pu-U, C-Pu-Zr, C-Rh-Th, C-Rh-U, C-Ru-Th, C-Ru-U, C-Th-U, C-Th-Zr, C-U-Zr, Ce-Mg-O, Cs-Fe-O, Cs-Mo-O, Cs-O-U, Cs-O-Zr, Fe-N-U, Fe-Na-O, Fe-O-Pb, Fe-O-U, Fe-U-Zr, Mo-O-U, Mo-Ru-U, Mo-Si-U, N-Pu-U, N-Pu-Zr, N-Th-U, N-U-Zr, Nb-Si-U, O-Pb-Zr, O-Pu-U, O-Pu-Zr, O-Th-Zr, O-U-Zr, Pd-Rh-U,...