Abstract
There are at least two conductivity maxima in the Ln 2O 3–TiO 2 (Ln = Ho–Lu) systems. High oxide-ion conductivity is typically offered by stoichiometric or near-stoichiometric Ln 2 + x Ti 2 − x O 7 − δ (Ln = Ho–Lu; x = 0–0.096) pyrochlores and heavily doped, disordered Ho 2 + x Ti 2 − x O 7 − δ (0.48 ≤ x ≤ 0.67) pyrochlores just near the boundary of the continuous P → F phase transition. The conductivity of the fluorite-like Ln 2 + x Ti 2 − x O 7 − δ (Ln = Er–Lu; 0.63–0.74) solid solutions is lower than that of the Ln 2 + x Ti 2 − x O 7 − δ (Ln = Er–Lu; x = 0–0.096) pyrochlores, similar to what was reported for the Y 2O 3–TiO 2 system.
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