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在900至1400℃温度范围内用CO—CO_2—SO_2混合气体平衡CeO_2测定了Ce_2O_2S的生成自由能,硫在氧化铈中的溶解度不高,而Ce_2O_2S的生成自由能比以前估计的要低得多,在1300℃时可低12千卡(50千焦耳)。在1000至1450℃温度范围,氧压力10~(-6)至10~(-18)大气压时,还通过用CO—CO_2混合气体平衡CeO_2测定了偏离化学计量的氧化铈的氧的离解压力。结果指出了从CeO_2到至少CeO_(1.72)的偏离化学计量的极大范围,用新的热力学资料估算了Fe—Ce—S—O系统的相平衡。计算表明,用铝和稀土脱氧剂处理的正常含硫异的钢,将很少形成Ce_2O_3而形成Ce_2O_2S或硫化铈。Ce_2O_2S的稳定范围也比以前认为的要小些。
The free energy of Ce 2 O 2 S was determined by the equilibrium of CeO 2 with CO-CO 2 -SO 2 mixed gas in the temperature range of 900 to 1400 ℃. The solubility of sulfur in cerium oxide was not high, while the formation energy of Ce 2 O 2 S was much lower than previously estimated , At 1300 ℃ can be as low as 12 kcal (50 kJ). The dissociation pressure of oxygen deviating from the stoichiometric cerium oxide was also determined by equilibration of CeO 2 with a CO-CO 2 gas mixture at a temperature range of 1000 to 1450 ° C. and an oxygen pressure of 10 -6 to 10 to -18 atm. The results point to a wide range of deviating stoichiometry from CeO 2 to at least CeO 1 (1.72) and the phase equilibrium of the Fe-Ce-S-O system was estimated using new thermodynamic data. Calculations show that the normal sulfur-containing steel treated with aluminum and rare earth deoxidizer will form little Ce_2O_3 to form Ce_2O_2S or cerium sulfide. The stable range of Ce 2 O 2 S is also smaller than previously thought.