The　phase　stability　diagram　of　the　V-O　Magneli　system　was　established　based　on　a　previous　work,　and　a　designed　quench　system　was　applied　to　the　experimental　investigation　to　examine　the　presented　thermodynamic　data.　This　equipment　can　bring　a　sample　to　a　set　temperature　in　several　minutes　and　quench　it　to　room　temperature　under　a　controlled　atmosphere.　The　atmosphere　is　controlled　by　setting　the　volume　ratio　of　CO2/H-2　to　300,　which　was　evaluated　by　thermodynamic　calculations.　By　tuning　the　temperature,　the　oxygen　partial　pressure　in　the　system　can　be　adjusted　across　regions　of　different　stable　phases.　V2O3　was　used　as　the　raw　material　for　oxidation　in　the　gas　mixture　at　equilibrium　temperatures　of　1323,　1373,　1423,　1473　and　1523　K.　The　XRD　results　of　the　quenched　samples　from　different　equilibriums　at　a　series　of　temperatures　verified　the　thermodynamic　considerations.　When　the　quenched　system　was　connected　to　a　balance,　conversion　curves　were　obtained　during　oxidation　in　the　mixture　gas　for　the　last　300　min　at　1373,　1423,　and　1473　K.　The　complete　oxidation　from　V2O3　to　V-4　O-7　proceeds　via　two　reactions:　one　from　V2O3　to　V3O5　and　the　other　from　V2O5　to　V4O7.　Fitting　results　showed　that　both　reactions　obey　the　first-order　Avrami-Erofeev　equation　but　with　different　parameters.　(C)　2019　Elsevier　B.V.　All　rights　reserved.