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The ionic conductivity of the Ln 2 Ti 2 O 7 (Ln=Tm–Lu) pyrochlores is found to correlate with the degree of anti-site cation disordering in these materials. The highest ionic conductivity is exhibited by Ln 2 Ti 2 O 7 containing 3.53–4.5% Ln Ti +Ti Ln anti-structure pairs. This degree of cation disordering can be achieved by heat treatment...
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