Abstract
Structural studies of compounds of variable composition and measurements of their conductivity have made it possible to identify new oxygen-ion-conducting rare-earth pyrochlores, Ln2Ti2O7 (Ln = Dy-Lu) and Ln2Hf2O7 (Ln = Eu, Gd), with intrinsic high-temperature oxygen ion conductivity (up to 1.4 × 10−2 S/cm at 800°C). Twenty six systems have been studied, and more than 50 phases based on the Ln2M2O7 (Ln= La-Lu; M = Ti, Zr, Hf) oxides have been synthesized and shown to be potential oxygen ion conductors. The morphotropy and polymorphism of the Ln2M2O7 (Ln = La-Lu; M = Ti, Zr, Hf) rare-earth pyrochlores have been analyzed in detail for the first time. Thermodynamic and kinetic (growth-related) phase transitions have been classified with application to the pyrochlore family.
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