FREE ENERGY OF FORMATION OF Na_2SnO_3 BY EMF MEASUREMENT USING β-ALUMINA SOLID ELECTROLYTE CELL

• 出 处: Acta Metallurgica Sinica(English Edition)
• 发表日期: 1992年10期
• 关键词: CELL electrolyte SOLID molar cited pellet tight mixing stabilized anode

A β”/β-Al_2O_3 solid electrolyte was prepared and used in a Na conentration galvanic cell:(-)O_2(in Ar),SnO_2,Na_2SnO_3|β“/β-Al_2O_3]NaCrO_2,Cr_2O_3,O_2(in Ar)(+).Theemf measurements were carried out in temperature range of 912—1223 K:E=652.1—0.2092 T+2.3(mV).Using this equation and cited free energies of formation of NaCrO_2,Cr_2O_3 and SnO_2,the molar free energy of formation of Na_2 SnO_3 may be calculated byΔG°=-1050+0.2544 T±5.4(kJ mol~(-1)).

Aβ ”/ β-Al_2O_3 solid electrolyte was prepared and used in a Na conentration galvanic cell: (-) O_2 (in Ar), SnO_2 and Na_2SnO_3 | β " / β-Al_2O_3] NaCrO_2, Cr_2O_3 and O_2 (in Ar) (+). Theemf measurements were carried out in temperature range of 912-1223 K: E = 652.1-0.2092 T + 2.3 (mV). Using this equation and cited free energies of formation of NaCrO_2, Cr_2O_3 and SnO_2, the molar free energy of formation of Na 2 SnO 3 may be calculated by ΔG ° = -1050 + 0.2544 T ± 5.4 (kJ mol -1).