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Microwave dielectric properties of xMgTiO3-(1 − x)(Na1/2Ln1/2)TiO3 ceramics

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Abstract

Na1/2Ln1/2)TiO3> ceramic has a high relative dielectric constant and a positive temperature coefficient of resonant frequency (τf) (where Ln represents a lanthanide: La+3, Pr+3, Nd+3 and Sm+3). On the other hand, MgTiO3 ceramic has a high Qf value and a negative temperature coefficient. We have investigated the microwave dielectric properties of MgTiO3-(1 − x)(Na1/2 Ln1/2) TiO3. In this system, there are no indications of a solid-solution or a secondary phase. There are mixed phases only with MgTiO3 and Na1/2 Ln1/2)TiO3 phases. Its dielectric characteristics (Q *f, temperature coefficient and dielectric constant) are intermediate between (Na1/2 Ln1/2) TiO3 and MgTiO3 and are predictable by the logarithmic mixing rule. The temperature coefficient of dielectric ceramic compositions approximates to zero at each Ln = La, x = 0.9, Ln = Pr, x = 0.87, and Ln = Nd, x = 0.84. At this time, there are Q *f values in the range of 55 000 to 28 000 GHz and relative dielectric constants in the range of 22 to 25.

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Authors and Affiliations

  1. Department of Electronic Engineering and Applied Science Research Institute, Sogang University, Seoul, 121-742, Korea

    Duck-Hwan Kim, Sang-Kyu Lim & Chul An

  2. Korea Electronics Technology Institute, Pyungtaek-si, Kyunggi-do, 451-860, Korea

    Jun-Chul Kim

Authors
  1. Duck-Hwan Kim
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  2. Sang-Kyu Lim
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  3. Chul An
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  4. Jun-Chul Kim
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Kim, DH., Lim, SK., An, C. et al. Microwave dielectric properties of xMgTiO3-(1 − x)(Na1/2Ln1/2)TiO3 ceramics. Journal of Materials Science: Materials in Electronics 10, 673–676 (1999). https://doi.org/10.1023/A:1008942720092

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