Results . DFT calculations and B-site supplement . To reoccupy the B-site vacancies of reduced SFNM scaffold during exsolution, the appropriate filling agent should be selected to initiate the TIE process. For this purpose, the co-segregation energies of Ni, Fe, and Mo at B-site of SFNM were calculated by DFT simulation, which are ?2.26?eV, ?1.46?eV, and ?1.06?eV, respectively (Fig.? 1a ). It indicates that Fe exsolves more favorably than Mo but less favorably than Ni30. Conside...