Abstract
Measurements of sodium tracer diffusion (Dt) and ionic conductivity (σ) have been made on the same single crystals of sodium beta-alumina of composition 1.23 Na20.11 Al2O3. The σ- measurements were made over the temperature 390–660 K using reversible (liquid sodium) electrodes. A fit to the conductivity data gives σT = 2470exp (−0.142eVkT)Ω−1cm−1K. The Dt, measurements employed two techniques, i.e. nondestructive profiling over the temperature range 210–750 K and cation exchange over the temperature range 505–970 K. The results of the two techniques were in close agreement and can be expressed as D = 2.12 ×10−4exp(−0.169 eVkT) cm2sec−1 for T>520K and D = 2.45 × 10−4exp(−0.164 eVkT) cm2 sec 470 K. The “transition” region between 470 and 520 K is not observed in the conductivity measurements. Silver cation exchange was used to determine the number of mobile sodium ions. A comparison of Dt and σ data yielded a Haven ratio that is temperature dependent, ranging in value from 0.45 at 870 K to 0.35 at 370 K.
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