The selected starting structures are records 107116 and 63832; both are stable endpoints in the full supplied system. Internal reaction-path breakpoints occur at y = 0.25, 0.30 and 0.40. The global minimum reaction energy per atom is -0.0930804872 eV at y = 0.30. The balanced reaction is 7 LiFePO4 + 3 Li3PS4 -> 4 Li4P2O7 + 2 FePS + 5 FeS2, using product records 115311, 48014 and 55448 respectively. At equimolar mixing the reaction energy is -0.0715301338 eV/atom, which misses the minimum by 0.0215503533 eV/atom. The endpoints are stable individually but their contact mixtures are not thermodynamically inert within this archive. Reaction rates and protective interphase formation are outside the supplied evidence.

The spreadsheet and reference.json provide the complete numerical result. Phase coefficients refer to reduced formulas. Energy-equivalent degenerate decompositions are accepted under the published balance and energy tolerances.
