Ionic injected current transients in strontium titanate single-crystals

Author

Zubko, P. ; Scott, J.F. ; Saad, M.M. ; Baxter, P. ; Bowman, R.M. ; Gregg, J.M.

Author_Institution

Dept. of Earth Sci., Cambridge Univ., UK

fYear

2005

fDate

11-14 Sept. 2005

Firstpage

136

Lastpage

138

Abstract

Current transients J(E,t,T) at high fields (E > 1 MV/cm) have been measured in SrTiO₃ crystals. The results are complex, with more than one transient peak time t_p. t_p varies from ca. 100 ms to 100 s as a function of temperature T and voltage V. One peak displays the dependence t_p=const. x (1/V) expected for the Many-Mark-Helfish cusp and may be due to space-charge-limited ionic conduction. The second peak is nearly voltage-independent and may arise from the Cox-Tredgold mechanism in which irreversible electrolytic reactions occur at the anode that facilitate hole injection. Both processes depend strongly upon the sample history.

Keywords

anodes; charge injection; electrolytes; ionic conductivity; space-charge-limited conduction; strontium compounds; transients; Cox-Tredgold mechanism; Many-Mark-Helfish cusp; SrTiO₃; SrTiO₃ crystals; anode; high fields; hole injection; ionic injected current transient peak time; irreversible electrolytic reaction; space-charge-limited ionic conduction; temperature function; voltage function; Anodes; Dielectric losses; Electrodes; Geoscience; Physics; Schottky barriers; Space charge; Strontium; Titanium compounds; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 2005. ISE-12. 2005 12th International Symposium on

Print_ISBN

0-7803-9116-0

Type

conf

DOI

10.1109/ISE.2005.1612337

Filename

1612337