Abstract
Sintered compacts of beta alumina have been made with additives of Li2O, MgO, NiO, CaO, and Y2O3. The motional narrowing and quadrupole interactions of sodium were investigated as a function of temperature and additive concentration by wide‐line NMR. The Li2O, MgO, and NiO additives are incorporated in the beta alumina structure and enhance Na motion; CaO dissolves and inhibits Na motion; and Y2O3 forms a second phase and has no effect on the Na. The effects of the additives are explained by the size and charge of the additive cation, and intragranular and intergranular conductivity in doped beta alumina ceramics are predicted.
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