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Thermal cycle characteristics of PTCR ceramic thermistors
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Ceramics.
2005 (English)In: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 118, no 1, 92-97 p.Article in journal (Refereed) Published
Abstract [en]

Thermal cycle treatment was performed in BaTiO3 and (Ba, Pb)TiO3 PTCR ceramic thermistors. When the treatment temperatures were higher than the Curie points, the room-temperature resistivities decreased at the initial thermal cycle stage, and then increased further with the thermal cycles. When the treatment temperatures were lower than Curie points, the room-temperature resistivities increased monotonously with the number of thermal cycle. The PTCR effects were also affected by the thermal cycle treatment. The oxygen absorption and oxidation were proposed for the monotonously increasing resistivity. Domain alternation and defect mechanisms were suggested to be the major cause for the resistivity decrease at the initial thermal cycle stage.

Place, publisher, year, edition, pages
2005. Vol. 118, no 1, 92-97 p.
Keyword [en]
PTCR ceramic thermistor, thermal cycle, electrical property, domain alternation, defect, oxidation, donor-doped batio3, barium-titanate, ferroelectric ceramics, liquid-phase, dopant
Identifiers
URN: urn:nbn:se:kth:diva-14451DOI: 10.1016/j.sna.2004.08.009ISI: 000226192700013Scopus ID: 2-s2.0-9944261341OAI: oai:DiVA.org:kth-14451DiVA: diva2:332492
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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