摘要
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 equilibrium oxygen partial pressure over Nonstoichiemetric SnO_2-x and the related two-phases mixture has been measured by Coulometrie titration using yttriastablized zirconia(YSZ)as the solid electrolyte at temperature range of 694—990K.The oxygen deficient x in SnO_2-x is related to the oxygen partial pressure PO_2 as:xocPO_2^(-1/6) around 900K.The standard Gibbs Free Energy change of defect reactien in SnO_2-x was determined as GSn_2-x =3.05×10~5—38.97T(J/tool)at temperature range 783—990K.The standard Gibbs Free Energy of for- mation of Sn_3O_4 may be adopted as f Sn_3O_4=-1163960 +417.36T(J/mol).
出处
《功能材料》
EI
CAS
CSCD
1992年第1期40-43,共4页
Journal of Functional Materials
关键词
非化学计量
性质
氧化锡
热力学
non-stoichiometric properties
Tin oxides system
thermodynamic data
Coulometric titration
