Diseño e implementación de un sistema automático de caracterización dieléctrica de materiales cerámicos para el laboratorio de electrocerámica del departamento de Física – EPN

Abstract

In the present project, an automatic dielectric characterization system is implemented with the equipment available in the Electroceramic Laboratory of the EPN, to perform the dielectric characterization of electroceramic materials through complex impedance spectroscopy (EIC). The dielectric characterization of electroceramic materials allows to determine the value of the dielectric constant and the value of the complex impedance for a wide range of temperature and for different frequencies of the applied field. The measurement is made at a certain temperature interval while the sample is heated slowly in a furnace at a constant heating rate and at the same time an electric field is applied at different frequency values. To heat the sample, an electric furnace controlled by the PI controller implemented with the EUROTHERM temperature controller is used. The test reports are automatically generated by the user interface of the automatic dielectric characterization system. From the peak of the graph Er '(real part of the dielectric constant) vs Temperature, the phase transition temperature from the ferroelectric to the paraelectric state of the samples analyzed is determined.