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

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

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Title: Microwave dielectric properties of MO -La2O3-TiO2 (M = Ca, Sr, Ba) ceramics
Author: Isuhak, Naseembeevi Jawahar; Narayana Iyer, Santha; Mailadil, Thomas Sebastian
Abstract: Single-phase polycrystalline ceramics in the MO-La2O3-Ti02 (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 Er in the range 42 to 54, high quality factors with Q x f in the range 16,222 to 50,215 GHz, and low Tf in the range -25 to +6 ppm3/°C. These high dielectric constant materials with high Q x 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
URI: http://dyuthi.cusat.ac.in/purl/1450
Date: 2002-12

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    This collection consists of published and unpublished working papers of Electronics

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