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本文使用自行设计的热重装置对MoO_2-Mo系中间氧化物热力学稳定性及金属-氧化物平衡作了H_2O/H_2气氛下气态平衡法的研究。在P_(H_2O)/P_(H_2)从0.123到0.507,温度由625至912℃范围内直接测定了反应1/2MoO_2+H_2=1/2Mo+H_2O(g)的平衡常数。平衡常数K_p与绝对温度T之间的关系可表达为方程:lgK_p=1.612(2257.7/T)。实验表明,Mo_3O,MoO和Mo_2O_3等中间氧化物在本研究的温度和氧压范围内不能作为热力学稳定相存在。
In this paper, the thermodynamic equilibrium of MoO_2-Mo intermediate oxide and the equilibrium of metal oxide have been studied by means of a thermogravimetric analyzer. The equilibrium constant of 1 / 2MoO_2 + H_2 = 1 / 2Mo + H_2O (g) was determined directly from 625 to 912 ℃ in the range of P_ (H_2O) / P_ (H_2) from 0.123 to 0.507. The relationship between the equilibrium constant K_p and the absolute temperature T can be expressed as an equation: lgK_p = 1.612 (2257.7 / T). Experiments show that intermediate oxides such as Mo 3 O, MoO and Mo 2 O 3 can not exist as thermodynamics stable phase in the range of temperature and oxygen pressure in this study.