Abstract
Two silver ion conducting solid electrolytes,Ag2HgI4 and Ag2CdI4, representing a wide class of AgI-based halogenide superionics have been the subjects ofstudy by means of electrical impedance spectroscopy, SEM, porosity measurements andfractal dimension analysis. Even though both materials have been obtained by the samemethod under strictly identical conditions they were found to exhibit certain differences atthe microstructural level. Thus, by the direct measurements of porosity and density it wasfound that the grain boundaries are better developed in silver mercuric iodide. On theassumption that pore geometry in the materials under study displays fractal character itwas shown that the fractal dimension of the pore contours is larger in the case ofAg2HgI4. Theseresults are in agreement with electrical studies which indicated that the grain boundary capacitancein Ag2CdI4 is two orders of magnitude smaller than that of the silver mercuric iodide.
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