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Sintering condition and PTCR characteristics of porous (Ba,Sr)(Ti,Sb)O3

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Abstract

We fabricated porous (Ba,Sr)(Ti,Sb)O3 ceramics by adding potato-starch (1–20 wt %) and investigated the effects of sintering temperature (1300–1450 °C) and time (0.5–10 h) on the positive temperature coefficient of resistivity characteristics of the porous ceramics. The room-temperature electrical resistivity of the (Ba,Sr)(Ti,Sb)O3 ceramics decreased with increasing sintering temperature, while that of the ceramics increased with increasing sintering time. For example, the room-temperature electrical resistivity of the (Ba,Sr)(Ti,Sb)O3 ceramics for the samples sintered at 1300 °C and 1450 °C for 1 h is 6.8×103 and 5.7×102 Ω cm, respectively, while that of the ceramics is 6.5×102 and 1.3×107 Ω cm, respectively, for the samples sintered at 1350 °C for 0.5 h and 10 h. In order to investigate the reason for the decrease and increase of room-temperature electrical resistivity of the samples with increasing sintering temperature and time, the average grain size, porosity, donor concentration of grains (N d), and electrical barrier height of grain boundaries (Φ) of the samples are discussed.

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Authors and Affiliations

  1. Institute of Advanced Materials, Inha University, Inchon, 402-751, South Korea

    J.-G. Kim & W.-P. Tai

  2. Developing Division, Chuo Precision Industrial Co. Ltd, 112-5, Kawa, Ageo-Shi, Saitama-Ken 362-0048, Japan

    J.-M. Lee

  3. Department of Electronic Materials Engineering, Kwangwoon University, Seoul, 139-701, South Korea

    J.-G. Ha

  4. Department of Advanced Materials Engineering, Korea Polytechnic University, Siheung, 429-793, South Korea

    S.-M. Lim

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  1. J.-G. Kim
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Kim, JG., Tai, WP., Lee, JM. et al. Sintering condition and PTCR characteristics of porous (Ba,Sr)(Ti,Sb)O3 . Journal of Materials Science: Materials in Electronics 15, 241–245 (2004). https://doi.org/10.1023/B:JMSE.0000012462.83222.aa

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