Effect of Microstructure on the PTCR Effect in Semiconducting Barium Titanate Ceramics |
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Authors: | MAKOTO KUWABARA |
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Affiliation: | Kyushu Institute of Technology, Tobata, Kitakyushu, 804 Japan |
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Abstract: | The microstructural influence on the PTCR effect in semiconducting barium titanate ceramics was studied and a method for preparing the ceramic bodies exhibiting a PTCR effect of more than seven orders of magnitude was established. Commercial barium titanyl oxalate was used as a starting material and Sb2O3 was added as a doping substance. The average grain sizes of the ceramic bodies prepared were 2 to 5 μm over a sintering range of 60 to 92%, to examine in detail the microstructural influence on the PTCR effect. No extra element, such as Mn or Cr, was added to develop the PTCR effect in the present PTCR materials. |
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