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(Co, Nb, Sm)-Doped tin dioxide varistor ceramics sintered using nanopowders prepared by coprecipitation method

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Abstract
(Co, Nb, Sm)-doped SnO2-based ceramic with varistor characteristics was successfully fabricated by a conventional sintering of nanosized (Co, Nb, Sm)-doped SnO2 powders prepared by coprecipitation method. Values of α∼38 and EB=1430 V/mm were obtained for the varistor doped with 0.05 mol % Sm2O3, sintered at 1200°C for 1 h. Microstructure development was studied by scanning and transmission electron microscopy, elemental analysis, and X-ray diffraction. The mean grain size of the SnO2-based varistor was 1.75 μm. No other phase besides SnO2 was observed in the varistor doped with 0.05 mol % Sm2O3. The presence of Nb, Co, and Sm inside the SnO2 grains confirmed the formation of solid solution. No segregation of Nb was observed and Nb atoms were homogeneously distributed. The excess amounts of Co were segregated at triple-junctions between SnO2 grains. A Sm-rich region with a typical thickness of 65 nm was observed at the grain boundary of the varistor.
Keywords
GRAIN-BOUNDARY PHENOMENA, ZINC-OXIDE VARISTORS, NONLINEAR ELECTRICAL BEHAVIOR, NONOHMIC BEHAVIOR, ZNO VARISTOR, FULLY DENSE, SYSTEM, SNO2-BASED VARISTORS, PLAUSIBLE CONCEPTS, DOPED SNO2 VARISTORS

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Citation

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Chicago
Bastami, Hajieh, Ehsan Taheri-Nassaj, Philippe Smet, Katleen Korthout, and Dirk Poelman. 2011. “(Co, Nb, Sm)-Doped Tin Dioxide Varistor Ceramics Sintered Using Nanopowders Prepared by Coprecipitation Method.” Journal of the American Ceramic Society 94 (10): 3249–3255.
APA
Bastami, H., Taheri-Nassaj, E., Smet, P., Korthout, K., & Poelman, D. (2011). (Co, Nb, Sm)-Doped tin dioxide varistor ceramics sintered using nanopowders prepared by coprecipitation method. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 94(10), 3249–3255.
Vancouver
1.
Bastami H, Taheri-Nassaj E, Smet P, Korthout K, Poelman D. (Co, Nb, Sm)-Doped tin dioxide varistor ceramics sintered using nanopowders prepared by coprecipitation method. JOURNAL OF THE AMERICAN CERAMIC SOCIETY. 2011;94(10):3249–55.
MLA
Bastami, Hajieh, Ehsan Taheri-Nassaj, Philippe Smet, et al. “(Co, Nb, Sm)-Doped Tin Dioxide Varistor Ceramics Sintered Using Nanopowders Prepared by Coprecipitation Method.” JOURNAL OF THE AMERICAN CERAMIC SOCIETY 94.10 (2011): 3249–3255. Print.
@article{1941430,
  abstract     = {(Co, Nb, Sm)-doped SnO2-based ceramic with varistor characteristics was successfully fabricated by a conventional sintering of nanosized (Co, Nb, Sm)-doped SnO2 powders prepared by coprecipitation method. Values of \ensuremath{\alpha}\ensuremath{\sim}38 and EB=1430 V/mm were obtained for the varistor doped with 0.05 mol \% Sm2O3, sintered at 1200{\textdegree}C for 1 h. Microstructure development was studied by scanning and transmission electron microscopy, elemental analysis, and X-ray diffraction. The mean grain size of the SnO2-based varistor was 1.75 \ensuremath{\mu}m. No other phase besides SnO2 was observed in the varistor doped with 0.05 mol \% Sm2O3. The presence of Nb, Co, and Sm inside the SnO2 grains confirmed the formation of solid solution. No segregation of Nb was observed and Nb atoms were homogeneously distributed. The excess amounts of Co were segregated at triple-junctions between SnO2 grains. A Sm-rich region with a typical thickness of 65 nm was observed at the grain boundary of the varistor.},
  author       = {Bastami, Hajieh and Taheri-Nassaj, Ehsan and Smet, Philippe and Korthout, Katleen and Poelman, Dirk},
  issn         = {0002-7820},
  journal      = {JOURNAL OF THE AMERICAN CERAMIC SOCIETY},
  keyword      = {GRAIN-BOUNDARY PHENOMENA,ZINC-OXIDE VARISTORS,NONLINEAR ELECTRICAL BEHAVIOR,NONOHMIC BEHAVIOR,ZNO VARISTOR,FULLY DENSE,SYSTEM,SNO2-BASED VARISTORS,PLAUSIBLE CONCEPTS,DOPED SNO2 VARISTORS},
  language     = {eng},
  number       = {10},
  pages        = {3249--3255},
  title        = {(Co, Nb, Sm)-Doped tin dioxide varistor ceramics sintered using nanopowders prepared by coprecipitation method},
  url          = {http://dx.doi.org/10.1111/j.1551-2916.2011.04467.x},
  volume       = {94},
  year         = {2011},
}

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