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利用Naβ″-Al_2O_3组成的电池直接测量Na_2O-SiO_2、Na_2O-CaO-SiO_2、Na_2O-Fe_2O_3-SiO_2及Na_2O-CaO-Fe_2O_3-SiO_2系中Na_2O的活度。该方法简单,测量迅速、准确。其电池形式为: Pt|O_2,Na_2O(硅酸盐)|Naβ″-Al_2O_3|α+β-Al_2O_3,O_2|Pt测量温度范围为1243—1460K。二元硅酸盐中SiO_2的活度已从测量的Na_2O活度数据利用Gibbs-Duhem方程算得,Na_2O的超额偏摩尔热力学量及系统的超额摩尔自由焓亦从所测的Na_2O活度算得。文中还计算了CaO及Fe_2O_3对Na_2O活度系数的影响量γ_(Na_2O)~(CaO)和γ_(Na_2O)~(Fe_2O_3),并且用二元及三元系得到的各活度系数值计算四元系的γ_(Na_2O(4)),计算结果与测量值十分一致。
The activity of Na_2O in Na_2O-SiO_2, Na_2O-CaO-SiO_2, Na_2O-Fe_2O_3-SiO_2 and Na_2O-CaO-Fe_2O_3-SiO_2 system was measured directly by Naβ “-Al_2O_3 battery. The method is simple, rapid and accurate The cell forms are Pt | O_2, Na_2O (silicate) | Naβ ”-Al_2O_3 | α + β-Al_2O_3, O_2 | Pt. The measurement temperature range is 1243-1460K. The activity of SiO 2 in binary silicates has been calculated from the measured Na 2 O activity data using the Gibbs-Duhem equation. The excess partial molar thermodynamic quantities of Na 2 O and the excess molar excess enthalpy of the system are also calculated from the measured Na 2 O activity. The effects of CaO and Fe_2O_3 on the activity coefficients of Na_2O were also calculated. The effects of CaO and γ_ (Na_2O) ~ (Fe_2O_3) on the activity coefficients of Na_2O were also calculated. Element of γ_ (Na_2O (4)), the calculated results and measured values are very consistent.