An Analysis of the Impedance of Polycrystalline Beta‐Alumina

Abstract

A procedure is described in this paper for distinguishing in the measured electrical properties of polycrystalline β‐alumina, the separate contributions of the grain boundaries and of the crystal, i.e., the grain interiors. This separation is brought about through the use of a model for these properties. Certain quantitative consequences of the model are developed and compared with experimental results. For most sintered β‐alumina ceramic, the electrical properties are determined more by the characteristics of the grain boundaries than by those of the interior of the grains.