Microwave Dielectric Properties of Ba<sub>4</sub>(Nd<sub>28/3-y</sub>R<sub>y</sub>)Ti<sub>18</sub>O<sub>54</sub> (R = Eu, Dy, Ho, Er and Yb) Solid Solutions

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  • Ohsato Hitoshi
    Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso–cho, Showa–ku, Nagoya 466–8555, Japan
  • Sugino Junichi
    Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso–cho, Showa–ku, Nagoya 466–8555, Japan
  • Komura Atsushi
    Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso–cho, Showa–ku, Nagoya 466–8555, Japan
  • Nishigaki Susumu
    Daiken Chemical Co. Ltd., 2–7–9 Hanaten–Nishi, Joto–ku, Osaka 536–0011, Japan
  • Okuda Takashi
    Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso–cho, Showa–ku, Nagoya 466–8555, Japan

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  • Microwave Dielectric Properties of Ba4(Nd28/3-y Ry)Ti18O54 (R=Eu, Dy, Ho, Er and Yb) Solid Solutions.

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We have investigated the formation and the microwave dielectric properties of the Ba4(Nd28/3-y Ry)Ti18O54 (R = Eu, Dy, Ho, Er and Yb) solid solutions in which R ions are substituted for Nd ions in Ba6-3xNd8+2xTi18O54 solid solutions with x=2/3. Based on the change of the volume of the unit cell, it was inferred that Eu, Dy, Ho and Er ions substituted into rhombic A1-sites, but Yb ions did smaller sites such as B-sites and C-sites after substituting A1-sites. The quality factor (Q·f) improved as the ionic radius of substituted R ions increased. In the Eu series, the best Q·f value of 10405 GHz was obtained. The temperature coefficients of the reasonant frequency (τf) in the Dy, Ho and Er series were improved by more than 50%, but the dielectric constant (εr) showed only a nominal change of about 3-4 in the vicinity of 80.

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