Crystalline Na, K, Li, and Ag β-alumina show glasslike variations of the dielectric susceptibility with temperature and frequency provided the measuring field is directed along the conducting planes. Only Li β-alumina shows variations of the dielectric susceptibility perpendicular to the conducting planes. The data are discussed in terms of the tunneling-states model of amorphous materials. The estimated average tunneling distances are {} 0.3 {}.
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Anthony et al. (1979) studied this question.
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