Phase diagram of Na3VCoP2O8F3 with Orb v3 conservative inf MPA; e_above_hull: 0.756629 eV/atom; predicted_stable: False
Na3(CoV)(PO4)2F3 — 50% Co substitution on V site in NVPF. P4_2/mnm, 36 atoms. From Park et al. (2026) BO framework: Co-V is second best practical candidate (paper uses Co0.50V1.50).