Abstract
Abstract Sodium tracer diffusivity and ionic conductivity have been measured from room temperature down to −79°C on the same single crystals of sodium-β-alumina of composition 1.23Na2O·11Al2O3. The Haven ratio decreases from 0.35 at room temperature to 0.18 at −79°C. The low value of HR and its temperature dependence can be explained in terms of high correlation effects for ionic diffusion due to large associated defects present at low temperatures.
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