CONCURRENT DIELECTRIC ANALYSIS DIFFERENTIAL THERMAL-ANALYSIS

An automated technique for concurrent application of Differential Thermal Analysis (DTA) and Dynamic Dielectric Analysis (DDA) is described. Two modes of operation of DDA are discussed: Mode A allows monitoring of the ac electrical properties of the test sample over a continuous range of frequencies from 50 Hz to 1 MHz at selected temperatures whereas Mode B facilitates examination of the dielectric behavior over a continuous range of temperatures from room temperature to 800 °C at selected frequencies. The complementary nature of information obtained from Mode A and Mode B and the concurrent application of DDA and DTA are illustrated for the crystal structure transformation in potassium perchlorate. © 1979, American Chemical Society. All rights reserved.