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

fYear

2010

fDate

4-9 July 2010

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICSD.2010.5568011

Filename

5568011