Resumo

GUILLEN-RODRIGUEZ, J.; ZAPATA-NAVARRO, A.; ZAPATA-TORRES, M.  e  MARQUEZ-HERRERA, A.. Desarrollo de un sistema para obtener ciclos de histéresis de materiales ferroeléctricos utilizando un potenciostato. Superf. vacío [online]. 2009, vol.22, n.4, pp.1-5. ISSN 1665-3521.

A novel system to measure ferroelectric properties using a potensiostat/galvanostat (POT/GAL) with a modified Tower-Sawyer circuit was implemented. A data acquisition card and a desktop computer were used to control the POT/GAL. The DAQ's analog and digital input/outputs ports were programmed for read the potential and current in the samples. The POT/GAL was used because it has a higher input impedance than homemade circuits used in laboratories, to obtain hysteresis loops of ferroelectric samples. A software was developed to fully control the POT/GAL, it also controls the amplitude and frequency of the potential applied to the samples. It obtains the spontaneous polarization versus electric field hysteresis loops, and display the values of coercive potential and remanent polarization. To explore the functionality or our system, commercial PZT (Lead Zirconate Titanate) ferroelectric capacitors (4,000 y 10,000μ² area, 255nm thickness) were characterized. The results of polarization versus electric potential of these capacitors for different frequencies (1-45 Hz) and different excitation voltages (1-9 volts) were made, the samples were also characterized with a commercial equipment from Radiant Technology Inc. The results showed a good agreement in both equipment.

Palavras-chave : Hysteresis; Ferroelectric; Potentiostat.