Authors:J. Mano, S. Lanceros-Méndez, A. Nunes and M. Dionísio
Dielectric experiments are often performed in non-isothermal conditions. Thus, there is a difference between the temperature of the sample and the sensor temperature. In this work we propose and compare three temperature calibration methods based on the detection of transitions or relaxations: i) the melting of high-purity metallic standards (indium and tin), ii) the 2nd order phase transition of a ferroelectric crystal (TGS); iii) the -relaxation of an amorphous polymer (poly(carbonate)). The results obtained from the three different methods were used to construct a calibration curve for a given heating rate.
Authors:Alexandre Berche, Pierre Benigni, Jacques Rogez and Marie-Christine Record
For each sample, DTA runs are performed at various heating and cooling rates in order to interpolate the temperature at thermodynamical equilibrium or null rate.
It was not possible to calibrate the measuring chain toward classical metallic