標題: EFFECT OF SOAKING TIME ON THE TEMPERATURE-COEFFICIENT OF RESISTIVITY OF SEMICONDUCTING BARIUM-TITANATE PTCR CERAMICS
作者: LU, YY
LAI, CH
TSENG, TY
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
公開日期: 1-Sep-1994
摘要: The influence of soaking time at 1200 degrees 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 degrees C increases the temperature coefficient of resistivity of PTCR ceramics.
URI: http://hdl.handle.net/11536/2344
ISSN: 0002-7820
期刊: JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume: 77
Issue: 9
起始頁: 2461
結束頁: 2464
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