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- Title
PTCR characteristics of semiconducting barium titanate ceramics produced by high-energy ball-milling.
- Authors
Park, K.; Ha, J.-G.; Kim, C.-W.; Kim, Jun-Gyu
- Abstract
We studied the influence of potato-starch content and ball-milling time on the positive temperature coefficient of resistance (PTCR) characteristics of porous and semiconducting barium titanate ceramics, which were produced by high-energy ball-milling followed by solid state reaction. The sintered samples at room temperature crystallized in the tetragonal structure, irrespective of the potato-starch content and ball-milling time. As the ball-milling time increased, the porosity and pore size of the samples decreased, while and the grain size increased. Higher potato-starch content yielded a smaller grain size and higher porosity. The potato-starch additive and ball-milling time had little influence on the donor concentration of the grains. A larger PTCR jump was obtained with the addition of potato-starch mainly as a consequence of an increase in the porosity. A higher ball-milling time yielded both lower electrical resistivity and a lower PTCR jump.
- Subjects
SEMICONDUCTORS; BARIUM; TITANATES; ELECTRONIC ceramics; BALL mills; POROSITY; STARCH; CRYSTALLIZATION; SOLID state chemistry
- Publication
Journal of Materials Science: Materials in Electronics, 2008, Vol 19, Issue 4, p357
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-007-9343-0