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Thermally Stimulated Relaxation in Fe‐Doped SrTiO 3 Systems:I. Single Crystals
Author(s) -
Liu Wayne,
Randall Clive A.
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02595.x
Subject(s) - activation energy , materials science , analytical chemistry (journal) , doping , relaxation (psychology) , dielectric spectroscopy , oxygen , vacancy defect , dipole , crystallography , chemistry , optoelectronics , electrode , organic chemistry , chromatography , psychology , social psychology , electrochemistry
Thermally stimulated depolarization current (TSDC) measurements were carried out on 0.1% and 1% iron (Fe)‐doped SrTiO 3 crystals to study various effects that are not detected from other electrical characterization methods such as impedance spectroscopy. Using this TSDC technique, the origins of different relaxations in Fe‐doped SrTiO 3 crystals were identified, and activation energy of the orientated dipole, energy depth of trap site, and trap density in the polarized samples were then estimated from TSDC measurements. From the resulting activation energy of 0.65±0.08 eV of trap charges, these traps are assigned to oxygen vacancy‐iron defect complexes. The high‐temperature peak at temperature ∼190°C is assigned to the relaxation current of oxygen vacancies and the calculated activation energy of 0.91±0.05 eV is in good agreement with the literature data.