Title :
Investigations on charge accumulation and relaxation in polycrystalline Al2O3: Correlations of surface potential measurements with other techniques
Author :
Molinié, Philippe ; Agnel, Serge ; Castellon, Jérôme
Author_Institution :
Dept. Energie, Supelec, Gif-sur-Yvette, France
Abstract :
Polycrystalline alumina plates have been charged by different methods (contact/corona), at temperatures from 300 to 500 K, and fields from 0.2 to 15kV/mm. The accumulation and relaxation of this charge has been studied using surface potential decay and voltage return techniques, together with current, Thermal Step Method (TSM) and Thermo Stimulated Currents (TSC) measurements. The observed conduction regime appears as nearly ohmic, but evidence of inner space charge effects is observed. An interfacial polarization model is proposed.
Keywords :
alumina; corona; dielectric materials; polarisation; space charge; surface potential; Al2O3; TSC measurement; TSM; charge accumulation; charge relaxation; inner space charge effect; interfacial polarization model; polycrystalline alumina plate; surface potential decay; surface potential measurement; temperature 300 K to 500 K; thermal step method; thermo stimulated current; voltage return technique; Current measurement; Electric potential; Materials; Space charge; Surface charging; Temperature measurement; Voltage measurement; Al2O3; interfacial polarization; power electronics; space charge; surface potential;
Conference_Titel :
Solid Dielectrics (ICSD), 2010 10th IEEE International Conference on
Conference_Location :
Potsdam
Print_ISBN :
978-1-4244-7945-0
Electronic_ISBN :
978-1-4244-7943-6
DOI :
10.1109/ICSD.2010.5568011
