16. Effects of Ionic Radii and Polarizability on the Microwave Dielectric Properties of Forsterite Solid Solutions

  1. Sheng Yao,
  2. Bruce Tuttle,
  3. Clive Randall and
  4. Dwight Viehland
  1. T. Sugiyama,
  2. H. Ohsato,
  3. T. Tsunooka and
  4. K. Kakimoto

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291252.ch16

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

Sugiyama, T., Ohsato, H., Tsunooka, T. and Kakimoto, K. (2005) Effects of Ionic Radii and Polarizability on the Microwave Dielectric Properties of Forsterite Solid Solutions, 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.ch16

Author Information

  1. Nagoya Institute of Technology, Gokiso-cho, showa-ku, Nagoya 466-8555, 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:

  • polarizability;
  • characteristics;
  • coefficient;
  • assumption;
  • cylindrical shape

Summary

Silicates composed of SiO4 tetrahedroa which have a half covalent bonds are expected low dielectric constants and hopeful as millimeter-wave dielectric materials. It was reported forsterite (Mg2SiO4) with very high quality factor (240000GHz) was prepared by adopting very pure MgO and SiO2 powder.1) But the temperature coefficient of resonant frequency (τf) of forsterite showed -70ppm/°C. We succeeded to improve τf Oppm/°C by addition of Rutile (TiO2), but the Q-f decreased.2) In this study, we tried to improve τf of forsterite by forming substituting Ni and Mn for Mg. The microwave dielectric properties were affected by the ionic radii and polarizability. Ions with larger ionic radii and polarizability bring τf toward minus, therefore, we will report the effects of ion with the smaller ionic radii and polarizabirity than Mg.