Abstract
Li+ is one of several monovalent cations known to completely replace Na+ in Na+ beta alumina. The conditions under which ion exchange is brought about determine whether the product is pure Li+ beta alumina or beta alumina containing both Na+ and Li+. Many investigators have believed that this process of ion exchange leads to cracking of polycrystalline Na+ beta alumina and, therefore, is not a satisfactory route for Li+ beta alumina preparation. It also has been reported that Li+ beta alumina has a single crystal ionic conductivity of only 1.6 x 10−4 (ohm cm)−1 at 25°C, 90 times less than that of Na+ beta alumina.1,2 The work discussed in this paper indicates that neither of these points is true.
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