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Microwave dielectric properties of MO-La2O3-TiO2 (M = Ca, Sr, Ba) ceramics

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Abstract

Single-phase polycrystalline ceramics in the MO-La2O3-TiO2 (M = Ca, Sr, Ba) system, such as cation-deficient hexagonal perovskites CaLa4Ti4O15, SrLa4Ti4O15, BaLa4Ti4O15, and Ca2La4Ti5O18 and the orthorhombic phases CaLa4Ti5O17 and CaLa8Ti9O31, were prepared through the solid-state ceramic route. The phases and structure of the ceramics were analyzed through x-ray diffraction and scanning electron microscopy. The microwave dielectric properties of the ceramics were studied using a network analyzer. The investigated ceramics show high εr in the range 42 to 54, high quality factors with Q × f in the range 16,222 to 50,215 GHz, and low τf in the range −25 to +6 ppm / °C. These high dielectric constant materials with high Q × f up to 50,215 GHz are suitable for applications where narrow bandwidth and extremely low insertion loss is necessary, especially at frequencies around 1.9 GHz.

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Authors and Affiliations

  1. Regional Research Laboratory, Council of Scientific and Industrial Research, 695 019, Trivandrum, India

    Isuhak Naseemabeevi Jawahar, Narayana Iyer Santha & Mailadil Thomas Sebastian

  2. Department of Electronics, Cochin University of Science and Technology, 682 022, Cochin, India

    Pezholil Mohanan

Authors
  1. Isuhak Naseemabeevi Jawahar
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  2. Narayana Iyer Santha
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  3. Mailadil Thomas Sebastian
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  4. Pezholil Mohanan
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Correspondence to Mailadil Thomas Sebastian.

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Jawahar, I.N., Santha, N.I., Sebastian, M.T. et al. Microwave dielectric properties of MO-La2O3-TiO2 (M = Ca, Sr, Ba) ceramics. Journal of Materials Research 17, 3084–3089 (2002). https://doi.org/10.1557/JMR.2002.0446

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