Add time:07/27/2019         Source:sciencedirect.com

The standard Gibbs energy of formation of Bi2O3 has been measured using a solid-state cell incorporating yttria-stabilized zirconia as the electrolyte and pure oxygen as the reference electrode. An innovative cell design, with a buffer electrode to absorb the electrochemical flux of oxygen through the electrolyte caused by trace electron/hole conduction, was used to measure the oxygen chemical potential over phase mixture Bi + Bi2O3 in the temperature range from 800 to 1473 K. A closed cell was used to avoid possible deviations from equilibrium caused by vaporization of bismuth and oxides of bismuth. The results for α-Bi2O3 in the temperature range from 800 to 1002 K can be summarized by,ΔGfo(±230)/Jmol−1=−584235+289.28(T/K)For δ-Bi2O3 in the temperature range from 1002 to 1078 K:ΔGfo(±230)/Jmol−1=−553669+258.77(T/K)The results are discussed in relation to thermodynamic information reported in the literature.

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