EQUILIBRIA OF SYSTEM MoO_3-MoO_2-H_2O-H_2 AND PHASE DIAGRAM FOR SYSTEM Mo-O BETWEEN 400 AND 700℃

Acta Metall Sin

1993, Vol. 29

Issue (11): 54-59 DOI:

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EQUILIBRIA OF SYSTEM MoO_3-MoO_2-H_2O-H_2 AND PHASE DIAGRAM FOR SYSTEM Mo-O BETWEEN 400 AND 700℃

FANG Zheng;CHEN Xinmin Central South University of Technology; Changsha

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FANG Zheng;CHEN Xinmin Central South University of Technology; Changsha. EQUILIBRIA OF SYSTEM MoO_3-MoO_2-H_2O-H_2 AND PHASE DIAGRAM FOR SYSTEM Mo-O BETWEEN 400 AND 700℃. Acta Metall Sin, 1993, 29(11): 54-59.

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Abstract The equilibria of the system MoO_3-MoO_2-H_2O-H_2 were investigated usinga specially designed thermogravimetric apparatus under the control of atmospheres. The equi-librium constants for the reaction MoO_3+H_2=MoO_2+H_2O(g) were measured at P_(H_2O)/p_(H_2) ratio between 0.412 and 0.609 and in the temperature range of 400 to 534℃ as follows:lg(p_(H_2O)/ P_(H_2)=0.702-739.8/T.The standard enthalpy of formation and absoluteentropy forMoO_3 at 298.15 K have been evaluated as-854.75kJ/mole and 78.16 J/Kmole respectively. The experimental results show that the magneli phases in theMoO_3-MoO_2 system cannot exist as the thermodynamically stable phases under the condi-tions studied. The phase diagram of the system Mo-O between 400 and 700℃ has also beengiven.

Key words: MoO_3 Magneli phase thermogravimetry equilibrium phase diagram

Received: 18 November 1993

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