Investigation on low room-temperature resistivity Cr/(Ba0.85Pb0.15)TiO3 positive temperature coefficient composites

Zeming He, J. Ma, Yuanfang Qu, Chenggang Wang

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    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.
    Original languageEnglish
    JournalMaterials Science & Engineering: B. Solid-state Materials for Advanced Technology
    Volume164
    Issue number2
    Pages (from-to)116-119
    ISSN0921-5107
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Solid Oxide Fuel Cells
    • Fuel Cells and hydrogen

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