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用ZrO_2(MgO)固体电解质氧浓差电池测定了1833,1873,1913K时,Fe-Nb(0.004—3.80 wt-%)-O熔体平衡时的氧活度,用X射线衍射相分析方法对铁液中Nb的脱氧产物进行了检验,计算出1833—1913K温度范围内的Nb-O平衡常数和其它有关热力学参数.实验结果表明当铁液中Nb含量高于0.20wt-%,Nb的脱氧产物是具有金红石结构的正方型NbO_2;在0.05—0.20wt-%的Nb含量范围内,脱氧产物是Nb_2O_5;当铁液中Nb含量低于0.05wt-%时,脱氧产物是FeNb_2O_6.随着铁液中Nb含量降低(即氧活度增大),Nb的脱氧产物形态发生转变,其顺序是:NbO_2→Nb_2O_5→FeNb_2O_6.
The oxygen activity of Fe-Nb (0.004-3.80 wt -%) - O melt at 1833, 1873 and 1913K was measured by ZrO_2 (MgO) solid electrolyte oxygen concentration cell. The X - ray diffraction The deoxidation products of Nb in molten iron were tested to calculate the equilibrium constants of Nb-O and other relevant thermodynamic parameters in the temperature range of 1833-1913 K. The experimental results show that when the Nb content in the molten iron is higher than 0.20 wt-%, the deoxidation of Nb The product is a square type NbO 2 with rutile structure; the deoxidation product is Nb 2 O 5 in the range of 0.05-0.20 wt-% Nb; the deoxidation product is FeNb 2 O 6 when the content of Nb in the molten iron is less than 0.05 wt-% In the liquid, the content of Nb decreases (ie, the oxygen activity increases), and the morphology of Nb deoxidation products changes. The sequence is NbO 2 → Nb 2 O 5 → FeNb 2 O 6.