E.m.f. measurements with solid electrolyte galvanic cells on the calcium oxide + zirconia system. Determination of the phase relationships

Abstract

E.m.f. measurements on the cell Pt | O₂| CaO(+ CaF₂)‖ CaF₂(tF^–= I)‖ ZrO₂–CaO | O₂| Pt have been carried out in the temperature range 900–1100°C to measure thermodynamic parameters of the lime + zirconia solid solutions and, possibly, to obtain complementary information on the phase-relationships across the concentration range investigated. Results show that the cubic field ranges only between x_CaO= 0.14 and 0.17 and that at x_CaO= 0.2 a CaZr₄O₉ phase is probably present. The results are discussed and compared with published data on the topic.