Determination of Standard Gibbs Energy of Formation of Ni3B2O6 by Electromotive Force Measurement Using Solid Electrolyte

The standard Gibbs energy of formation of Ni3B2O6 were determined by measuring electromotive forces of the galvanic cell using an Y2O3-stabilized ZrO2 solid electrolyte (YSZ(8)). Ni3B2O6 was prepared by the spray drying method. The cell constructed for measuring the emf was as follows: Pt|Ni, Ni3B2O6, B2O3|YSZ(8)|O2 in air|Pt. The electromotive forces of this cell (E/V) were measured as a function of temperature (T/K) as follows: E=1.214-4.522×10-4 T±2×10-3, where temperature range was 1193~1393 K. Using this emf, the standard Gibbs energy of formation of Ni3B2O6 (ΔfGo(Ni3B2O6)/J•mol-1) was calculated as follows: ΔfGo(Ni3B2O6)=-1934000+455.6T±1000 where the standard pressure is 1 bar (100 kPa).