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采用库伦滴定法,用 YSZ 固体电解质测定694～990K 温度范围与非化学计量氧化锡 SnO_(2-x)以及两相混合物平衡的氧气分压。在900K 附近,平衡氧气分压 Po_2与 SnO_(2-x)中的氧缺位浓度 x 间呈 x∞Po_2~(-1/6)关系。在783～990K 温度范围,SnO_(2-x)中缺陷反应的标准吉布斯自由能变化温度关系式为:△G~Φ_s_no2_=3.05×10~5-38.97T(J/mol)。在696～731K 温度范围,Sn_3O_4的标准生成自由能温度关系式为:△_fGΦ=-1163960+417.36T(J/mol)。
The coulometric titration method was used to measure the oxygen partial pressure of 694-990 K with the non-stoichiometric tin oxide SnO 2 -x and the two-phase mixture with YSZ solid electrolyte. In the vicinity of 900 K, the oxygen partial pressure (Po 2) and the oxygen vacancy concentration (x) in the SnO 2 -x were x∞Po_2 ~ (-1/6). In the temperature range of 783-990K, the Gibbs free energy of the defect reaction in SnO_ (2-x) is: △ G ~ Φ_s_no2_ = 3.05 × 10 ~ 5-38.97T (J / mol). In the temperature range of 696 ~ 731K, the standard formation temperature of Sn_3O_4 is: △ _fGΦ = -1163960 + 417.36T (J / mol).