X-Ray and Electrical Conductivity Study of the Fluorite Phase in the System ZrO2–CaO

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Abstract
In the ZrO2–CaO system cubic solid solutions of the fluorite‐type structure are formed between 12 and 22 mole % CaO for specimens fired at 2000°C and subsequently quenched from 1400°C. The lattice parameter increased linearly from 5.125 to 5.144 Å with increasing CaO content. Results of x‐ray diffraction intensity studies favored the oxygen‐ion vacancy model over the cation interstitial model for these solid solutions. As the CaO content was increased from 13 to 20 mole %, the electrical conductivity at 1000°C decreased from 5×10—2 to 6×10—3 Ω—1 cm—1 and the activation energy increased from 1.11 to 1.35 eV. Specimens heated at 1000°C for one week showed extra x‐ray diffraction lines. These data coupled with accompanying changes in electrical conductivity are discussed in terms of an order—disorder transition.

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