Journal article
Investigation on low room-temperature resistivity Cr/(Ba0.85Pb0.15)TiO3 positive temperature coefficient composites
Ceramic processing, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Nanyang Technological University4
Tianjin University5
Low room-temperature resistivity positive temperature coefficient (PTC) Cr/(Ba0.85Pb0.15)TiO3 composites were produced via a reducing sintering and a subsequent oxidation treatment. The effects of metallic content and processing conditions on materials resistivity–temperature properties were discussed.
Using these special processes, the prepared composite with 20 wt% Cr possessed low room-temperature resistivity (2.96 Ω cm at 25 °C) and exhibited PTC effect (resistivity jump of 10), which is considered as a promising candidate for over-current protector when working at low voltage. The grain-boundary potential barrier of the prepared PTC composite was evaluated based on the Heywang model and the experimental data.
The potential barrier was from 0.00 to 0.11 V in the temperature range of 180–270 °C, which is believed to be the first reported intrinsic parameter for PTC composite, determined from the experiment.
Language: | English |
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Year: | 2009 |
Pages: | 116-119 |
ISSN: | 18734944 and 09215107 |
Types: | Journal article |
DOI: | 10.1016/j.mseb.2009.08.003 |