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                  ¦¤G0 (kJ/mol O2)
                  900 oC             950 oC
Ta2O5         -613.366           -605.117
Cr2O3         -551.992           -543.673


                         ¦¤G0 (kJ/mol O2)
                          900 oC             950 oC
2/5Ta2O5         -613.366           -605.117
2/3Cr2O3         -551.992           -543.673
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