22. Electrical Properties of Quaternary Pyrochlore Ruthenates for Thick-Film Resistors

  1. Sheng Yao,
  2. Bruce Tuttle,
  3. Clive Randall and
  4. Dwight Viehland
  1. K. Yokoyama1,
  2. K. Kakimoto1,
  3. H. Ohsato1,
  4. J. Kinoshita2 and
  5. Y. Maeda2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291252.ch22

Advances in Electronic Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 26, Number 5

Advances in Electronic Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 26, Number 5

How to Cite

Yokoyama, K., Kakimoto, K., Ohsato, H., Kinoshita, J. and Maeda, Y. (2005) Electrical Properties of Quaternary Pyrochlore Ruthenates for Thick-Film Resistors, in Advances in Electronic Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 26, Number 5 (eds S. Yao, B. Tuttle, C. Randall and D. Viehland), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291252.ch22

Author Information

  1. 1

    Materials Science and Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

  2. 2

    KOA Corporation 14016, Naka-minowa, Minowa-machi, Kamiina-gun, Nagano 399-4697, Japan

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982350

Online ISBN: 9780470291252

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Keywords:

  • synthesized;
  • thermal expansion;
  • coefficient;
  • resistivity;
  • thmphysic properties

Summary

Bi2-xLnxRu2O7 (Ln = Sm, Dy) have been synthesized and characterized by using X-ray diffraction, electrical resistivity measurements, and thermal expansion coefficient measurements. The lack of bismuth and oxygen site occupancy was observed in the composition Bi2Ru2O7 by using Rietveld refinement. In the lanthanoid-rich, a change from metallic to semi-conducting behavior was observed at 0.8 < × < 1.0 and 0.6 < × < 0.8 in Bi2-xSmxRu2O7 and Bi2-xDyxRu2O7, respectively. The good average linear thermal expansion coefficient (α1) 1.2 × 10−5 /K in the temperature range between 300 and 1100K was obtained by substituting lanthanoid, in the composition Bi1.8Sm0.2Ru2O7 and Bi1.8Dy0.2Ru2O7. It was superior to the value α1 = 3.2 × 10−5 /K of Bi2Ru2O7.