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Effect of Soaking Time on the Temperature Coefficient of Resistivity of Semiconducting Barium Titanate PTCR Ceramics
Author(s) -
Lu YuhYih,
Lai ChunHung,
Tseng TseungYuen
Publication year - 1994
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.1151-2916.1994.tb04623.x
Subject(s) - electrical resistivity and conductivity , temperature coefficient , materials science , barium titanate , ceramic , grain boundary , acceptor , mineralogy , composite material , condensed matter physics , chemistry , electrical engineering , microstructure , physics , engineering
The influence of soaking time at 1200°C on the temperature coefficient of resistivity (TCR) of semiconducting barium titanate ceramics has been investigated. It is found that soaking duration has influence on the room‐temperature resistivity, the maximum resistivity, the temperature ( T max ) at which the maximum resistivity appears, and TCR of the positive temperature coefficient of resistivity (PTCR) ceramics. The increased room‐temperature resistivity with the increase of soaking time is contributed mainly by the increase of grain boundary resistivity examined by the complex‐plane impedance method. The obtained surface acceptor density ( N s ) by capacitance–voltage measurement is found to increase with the soaking duration. The higher N s contributes to higher built‐in potential and results in lower T max and higher maximum resistivity. Therefore, the increased surface acceptor density from increasing the soaking time at 1200°C increases the temperature coefficient of resistivity of PTCR ceramics.