Some Characteristics of the Maxwell-Wagner Type Dielectric Dispersion

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The equations representing the Maxwell-Wagner type dielectric dispersion which was often observed in heterogeneous material were derived by assuming that the heterogeneity of specimen was represented by an equivalent circuit composed of a series connection of C_1, R_1 and C_2, R_2 (two-layer model). The equations obtained were of exactly the same form as those of Debye type. But if this Maxwell-Wagner type dielectric dispersion was observed as a function of temperature keeping the frequency of measurement fixed as a parameter, the following three different cases were found to occur : (1) ordinary dielectric dispersion which had the same characteristics as those of Debye type, (2) Anti-Debye type dielectric dispersion, in which the peak of ε" shifted to lower frequency with the increase of temperature, and (3) no dielectric dispersion. The criterion for the experimental discrimination of the two types of dielectric dispersion was discussed, and it was found that only in some special cases was this discrimination possible. A calculation was also made with the sample composed of three electrically different materials (three-layer model). In this case two dielectric dispersions were expected to occur. Utilizing the equations for representing the Maxwell-Wagner type dielectric dispersion produced by two-layer circuit, the method of measuring the values of ε' and ε" of comparatively high loss material was obtained and it was applied to the determination of ε', ε" of Mn-ferrite.
東北大学の論文

Some Characteristics of the Maxwell-Wagner Type Dielectric Dispersion

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