DIFFERENTIAL IMPEDANCE ANALYSIS ON SINGLE-CRYSTAL AND POLYCRYSTALLINEYTTRIUM IRON GARNETS

The resistivity of single crystal and polycrystalline Yttrium Iron Gar net was investigated by tile Complex Impedance Method, distinguishing the resistivity of the bulk material Ph from the resistivity of the gr ain boundaries p(gb). TWO different approaches are used for the determ ination of the model structure: (i) a theoretical, in which the struct ure is assumed apriori as a Voight-type model and (ii) a structural, i n which the model is extracted from the experimental data. The second approach is based on the recently developed Differential Impedance Ana lysis. The results obtained illustrate the advantages of the new metho d, which can give information about the mechanism of the ferrite condu ctivity and may enhance the knowledge of the physical nature of the pr ocess.