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利用下列组装的固体电解质定氧电池: Mo|Mo,MoO_2‖ZrO_2(MgO)‖[Nb],NbO_2|Mo+ZrO_2金属陶瓷,Mo对Fe-Nb熔体中Nb的活度在三个温度下(1823、1853及1873K)进行研究。在净化的氩气气氛下,将固态NbO_2细粉撒布在含铌铁液之上,以取得[Nb]与[O]的反应迅速达到平衡。有时不加任何固体料,使熔体中形成的脱氧产物自己上浮,此脱氧产物热力学证明是NbO_2。对测定的a_0实验数据进行加工处理,求出下列结果: 1.脱氧反应的自由能 [Nb]+[O]=NbO_2(s); △G°=-89710+28.27T 2.Nb在铁液中的溶解自由能 Nb_((s))=[Nb]_％; △G=-32090+7.9T; γ°_(1873)=1.60 Nb_((l))=[Nb]_％; △G°=-38520+10.24T; γ°_(1873)=0.92 3.Nb本身的活度相互作用系数 当[Nb]含量大约低于0.2时,脱氧产物和其它合金元素如Al、Cr、V等相似,形成了复合氧化物如FeO·NbO_2。后者的生成自由能估计为:随着熔体中[Nb]含量的继续下降,对生成其它脱氧产物的可能性,本文也进行了讨论。
The use of the following assembled solid electrolyte constant oxygen batteries: Mo | Mo, MoO 2 “ZrO 2 (MgO)” [Nb], NbO 2 | Mo + ZrO 2 cermet, Mo activity of Nb in Fe-Nb melt at three temperatures (1823, 1853 and 1873K). Under the purifying argon atmosphere, the solid NbO 2 fine powder is sprinkled on the niobium-containing molten iron to achieve a rapid equilibrium between [Nb] and [O]. Sometimes without any solid material, the melt formed in the deoxidation products themselves floating, the deoxidation products thermodynamically proved to be NbO_2. The measured a_0 experimental data processing, obtained the following results: 1. Deoxidation reaction free energy [Nb] + [O] = NbO_2 (s); △ G ° = -89710 +28.27T 2.Nb in the liquid iron () = [Nb] _%; ΔG = -32090 + 7.9T; γ ° _ (1873) = 1.60 Nb_ (l) = [Nb] _%; ΔG ° = -38520 + 10.24T; γ ° _ (1873) = 0.92 3.Nb Activity Interaction Coefficient When the content of Nb is lower than about 0.2, deoxidation products and other alloying elements such as Al, Cr, V, etc. Similarly, a complex oxide such as FeO.NbO_2 is formed. The latter’s free energy can be estimated as follows: As the [Nb] content in the melt continues to decrease, the possibility of generating other deoxidation products is also discussed.