Gibbs Free Energy of Formation of 3Y_2O_3·5Al_2O_3

• 作 者: 徐秀光 王常珍 涂赣峰
• 机 构: Northeast University of Technology Shenyang,China,Northeast University of Technology,Shenyang,China,
• 出 处: Journal of Materials Science & Technology
• 发表日期: 1989年04期
• 关键词: electrolyte Gibbs l_2O_3 sintering adding enable alumina Stable quartz moisture

Thermodynamic properties of 3Y_2O_3·5Al_2O_3double compound have been determined with CaF_2single crystal electrolyte galvanic cell at1049 K to 1230 K.The galvanic cell used canbe expressed as:Pt,O_2(g)丨Y_2O_3(s),YOF_((s))丨CaF_2丨YOF_((s)),3Y_2O_3·5Al_2O_(3(s))丨Al_2O_(3(s))丨O_2(g),Pt,of which the cell reaction is;3Y_2O_(3(s))+SAl_2O_(3(s))=3Y_2O_3·SAl_2O_(3(s))The following result is obtained:A_fG°(3Y_2O_3·5Al_2O_3)=-939500+765.90T±710J/molwhere,△fG°(3Y_2O_3·5Al_2O_3)is the free energyof formation of 3Y_2O_3·5Al_2O_3 from Y_2O_3 andAl_2O_3.

Thermodynamic properties of 3Y_2O_3 · 5Al_2O_3double compound have been determined with CaF_2 single crystal electrolyte galvanic cell at1049 K to 1230 K. The galvanic cell can be expressed as: Pt, O_2 (g) 丨 Y_2O_3 (s), YOF_ ((s)) 丨 CaF_2 (3) (s)) 丨 O_2 (g), Pt, of which the cell reaction is; 3Y_2O_ (3 (s)) + SAl_2O_ (3 (s)) 3Y_2O_3 · 5Al_2O_3 (s) 3 3 ⁢ s ⁢ s = 3Y_2O_3 · SAl_2O_3 (s)) The following result is obtained: A_fG ° (3Y_2O_3 · 5Al_2O_3) = -939500 + 765.90 T ± 710 J / molwhere, ΔfG ° (3Y_2O_3 · 5Al_2O_3) is the free energy of formation of 3Y_2O_3 · 5Al_2O_3 from Y_2O_3 and Al_2O_3.