锰-氧系热力学研究Mn₂O₃-Mn₃O₄-O₂平衡和MnO₂-Mn₂O₃-O₂平衡

来源期刊：中南大学学报(自然科学版)1982年第3期

论文作者：陈启元 陈新民

文章页码：1 - 9

关键词：平衡温度； 热力学研究； 逼近法； 平衡点； 石英弹簧； 分解温度； 热重法； 平衡数据； 稳定态； 失重

摘    要：本文作为 Mn—O 系热力学研究的第一部分,用热重法分别研究了 Mn₂O₃—Mn₃O₄—O₂平衡和 MnO₂—Mn₂O₃—O₂平衡。前一平衡用增失重反复逼近法得到了迄今较为可靠的稳定态平衡结果,后一平衡由实验结果对文献进行了评价。最后给出了 Mn₃O₄、Mn₂O₃和 MnO₂的稳定存在区。

Abstract: As the first part of the thermodynamical investigation of the system Mn-O,the Mn₂O₃-Mn₃O₄-O₂ and MnO₂-Mn₂O₃-O₂ equilibria have been studied with thermogravimetrie method in the temperature intervals 790°to 990℃ and 466° to 495℃,respectively,and at O₂ partial pressures ranging from 0.036 to 0.99 arm.and from 0.20 to 0.99 atm.,respectively.For the first equilibrium,the equilibrium temperatures at five various O₂ pressures are obtained by means of the method approaching from both sides repeatedly with gaining or losing weight,which is for the first time applied to this equilibrium.The O₂ pressure-temperature relationship lgPo₂=7.6050-9627. 9/T （790-990℃） or lgPo₂=-11380.8/T+13.900-1.3391gT-0.656×10^-3T+1.113 ×10⁵T^-2（25-1080℃） and the thermodynamical data at 25℃:△H_298.15⁰=47.6 Kcal and △S_298.15⁰=38.27e.u.are found.It seems to have been the most re- liable results up to now.For the second equilibrium,the equilibrium tempe- rature at the O₂ pressure 0.20 or 0.99 atm.is below 466°or 495℃,respectively. Thus an evaluation to the previous works is made.At the end,the stable existing regions of various manganese oxides are given.