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dc Electrical Degradation of Perovskite‐Type Titanates: II, Single Crystals
Author(s) -
Waser Rainer,
Baiatu Tudor,
Härdtl KarlHeinz
Publication year - 1990
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.1151-2916.1990.tb09810.x
Subject(s) - materials science , dopant , annealing (glass) , doping , degradation (telecommunications) , perovskite (structure) , acceptor , electrode , electric field , chemical engineering , analytical chemistry (journal) , mineralogy , condensed matter physics , electronic engineering , optoelectronics , chemistry , composite material , physics , quantum mechanics , chromatography , engineering
The resistance degradation of Al‐doped, Ni‐doped, and Fedoped SrTiO 3 single crystals is studied as a function of the temperature and the applied dc voltage. The individual influence of the acceptor dopants is discussed. Data of the mobility of oxygen vacancies are obtained from the determination of the time evolution of the electric field distribution between the electrodes, from electrocoloration studies, and from an examination of the thermal annealing after degradation. In a numerical calculation based on the defect chemistry and transport properties of titanates, the electrocoloration process is simulated and a qualitative explanation of the degradation process is presented.