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Acta Metall Sin  1985, Vol. 21 Issue (2): 73-80    DOI:
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A STUDY ON Fe-Nb-O EQUILIBRIA AND THEIR THERMODYNAMIC PARAMETERS
GU Longjian;TANG Zhonghe Cetral Iron and Steel Research Institute;Ministry of Metallurgical Industry;Beijing
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GU Longjian;TANG Zhonghe Cetral Iron and Steel Research Institute;Ministry of Metallurgical Industry;Beijing. A STUDY ON Fe-Nb-O EQUILIBRIA AND THEIR THERMODYNAMIC PARAMETERS. Acta Metall Sin, 1985, 21(2): 73-80.

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Abstract  Equilibrium oxygen activities in Fe-Nb-O melts containing 0.004 to 3.80wt-% Nb were determined by oxygen concentration cell with solid electrolyte ZrO_2(MgO)at 1833,1873 and 1913 K.The deoxidation products were identified byX-ray diffraction analysis to be tetragonal NbO_2 with a rutile structure whenNb>0.20 wt-%,to be Nb_2O_5 when Nb content being in the range of 0.05 to0.20 wt-% and to be FeNb_2O_6 when Nb<0.05 wt-%.With decreasing Nb content,i.e.with increasing oxygen activity,the form of the deoxidation products changesin the following order:NbO_2→Nb_2O_5→FeNb_2O_6With the experimental data the Nb-O equilibrium constants and other relatedthermodynamic parameters in the range of 1833 to 1913 K were calculated.
Received:  18 February 1985     
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