INTEMA 05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Estudio de la degradación de varistores de ZnO utilizando
Autor/es:
MIGUEL PONCE; CARLOS MACCHI; FEDERICO SCHIPANI; CELSO ALDAO; ALBERTO SOMOZA
Lugar:
Santa Fe
Reunión:
Congreso; CONGRESO INTERNACIONAL DE METALURGIA Y MATERIALES SAM-CONAMET/IBEROMAT/MATERIA 2014; 2014
Institución organizadora:
Asociación Argentina de Materiales / Sociedad Chilena de Metalurgia y Materiales
Resumen:
The effects of a degradation process on the structural and electrical properties of ZnO-based varistors induced by the application of dc bias voltage were
analyzed. Capacitance and resistance measurements were carried out to electrically analyze and characterize the polycrystalline semiconductor before and after
mild degradation. Vacancies changes in the varistors due to degradation process were studied with positron annihilation spectroscopy. Variations on the
potential barrier height and effective doping concentration were determined by fitting the experimental data from impedance spectroscopy measurements. These
results are consistent with vacancy-like concentration changes determined specifically using positron annihilation lifetime spectroscopy.
