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基于熔体组元离子半径和Butler方程,建立RE2O3-MgO-SiO2(RE=La,Nd,Sm,Gd和Y)熔体表面张力热力学计算模型。本模型利用纯组元的表面张力和摩尔体积以及熔体中各组元阳离子和阴离子半径可以获得E2O3-MgO-SiO2熔体表面张力随熔渣成分和温度的变化规律。计算1873 K La2O3-MgO-SiO2熔体等表面张力线并研究熔体成分对表面张力的影响。1873 K的纯组元La2O3,Gd2O3,Nd2O3和Y2O3的表面张力通过本模型计算分别为686、677、664和541 m N/m。除了Y2O3外,纯稀土氧化物的表面张力随其阳离子磁场强度增加而呈线性减小,而Y2O3的表面张力相对减小更多。表面张力的计算结果与文献数据一致,1873 K本模型平均偏差为1.05%。
Based on the ionic radius and Butler equation of the melt component, a thermodynamic calculation model for the surface tension of RE2O3-MgO-SiO2 (RE = La, Nd, Sm, Gd and Y) melt was established. In this model, the surface tension and molar volume of pure components and the cation and anion radius of each component in the melt can be used to obtain the change law of the surface tension of E2O3-MgO-SiO2 melt with slag composition and temperature. The surface tension of 1873 K La2O3-MgO-SiO2 melt was calculated and the effect of melt composition on surface tension was studied. The surface tension of pure La2O3, Gd2O3, Nd2O3 and Y2O3 at 1873 K was 686, 677, 664 and 541 mN / m, respectively. Except for Y2O3, the surface tension of pure rare earth oxides linearly decreases with the increase of the magnetic field intensity of the cation, whereas the surface tension of Y2O3 decreases relatively more. The calculation of surface tension is consistent with the literature data. The average deviation of 1873 K model is 1.05%.