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(1 − x)CaTiO3–x(Li0.5Nd0.5)TiO3 for ultra-small dielectrically loaded antennas

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Abstract

Microwave (MW) dielectric ceramics based on the solid solution (1 − x)CaTiO3–x(Li0.5Nd0.5)TiO3 (0.25 ≤ x ≤ 1.0) were prepared by conventional solid-state synthesis using the mixed oxide route. Compositions closest to zero τf (+65 ppm/°C) were obtained at x = 0.8 where εr = 110 and the microwave quality factor, Qf 0 ≅ 2600 GHz for samples sintered at 1300 °C. To reduce the sintering temperature and compensate for any Li2O loss during fabrication, ≤0.5 wt% 0.5Li2O–0.5B2O3 was added as a sintering aid in the form of raw oxides (LBR) and also as a pre-reacted glass (LBG). 0.5 wt% LBR was the most effective, reducing the temperature to achieve optimum density by ~50 °C with no significant deterioration of microwave properties (εr = 115, τf = +65 ppm/°C and Qf 0 ≅ 2500 GHz). The high permittivity and relatively low sintering temperatures (1250 °C) are ideal for the development of low cost ultra-small dielectric loaded antenna, assuming the system can be tuned closer to zero by fractionally increasing x.

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Authors and Affiliations

  1. Department of Engineering Materials, Sheffield University, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK

    D. A. Abdel Aziz, I. Sterianou & I. M. Reaney

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  1. D. A. Abdel Aziz
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  2. I. Sterianou
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  3. I. M. Reaney
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Corresponding author

Correspondence to I. M. Reaney.

Additional information

D. A. Abdel Aziz—on secondment from Department of Ceramics, National Research Centre, 12622, Dokki, Cairo, Egypt.

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Abdel Aziz, D.A., Sterianou, I. & Reaney, I.M. (1 − x)CaTiO3–x(Li0.5Nd0.5)TiO3 for ultra-small dielectrically loaded antennas. J Mater Sci 44, 6247–6250 (2009). https://doi.org/10.1007/s10853-009-3853-5

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  • DOI: https://doi.org/10.1007/s10853-009-3853-5

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