INVESTIGADORES
PONCE Miguel Adolfo
artículos
Título:
Mild degradation processes in ZnObased
Autor/es:
MIGUEL PONCE; CARLOS MACCHI; FEDERICO SCHIPANI; CELSO ALDAO; ALBERTO SOMOZA
Revista:
PHILOSOPHICAL MAGAZINE
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Lugar: Londres; Año: 2015
ISSN:
1478-6435
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
analysed. Capacitance and resistance measurements were carried out to electrically
characterize the polycrystalline semiconductor before and after different
degrees of mild degradation. Vacancies? changes in the varistors were studied
with positron annihilation lifetime spectroscopy. Variations on the potential
barrier height and effective doping concentration were determined by fitting
the experimental data from impedance spectroscopy measurements. These
results indicate two different stages in the degradation process consistent with
vacancy-like concentration changes.