Microwave Behavior of Debye-Hückel Clouds in AgBr

The real and imaginary parts of the complex dielectric constant, ${\epsilon }^{\prime }-i{\epsilon }^{\prime \prime }$, have been measured at 24 kMc/sec as a function of temperature between 30° and 400°C. A maximum in ${\epsilon }^{\prime }$ is observed near 350°C; ${\epsilon }^{\prime \prime }$ increases rapidly, asymptotically approaching the value observed at lower frequencies in the intrinsic range near the melting point. These results are not explicable in terms of the currently accepted form of the Debye-Falkenhagen dispersion theory. A crude model is discussed which suggests that an alternative solution of the differential equation occurring in this theory affords an appropriate description of the observed behavior.