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Microwave dielectric properties of doped Ba6−x(Sm1−y′Ndy)8+2x/3Ti18O54 oxides

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Abstract

Dielectric ceramic compositions for microwave applications belonging to the (BaO)-(Nd2O3)-(Sm2O3)-(TiO2) phase diagram were studied. Two compositions were selected for study, the doping effect of MnO2, WO3, CaO on dilatometry, microstructure and microwave properties. The effect of the nature and the amount of dopants on microstructure and microwave properties were clearly demonstrated. The effect of the addition of 1 or 2wt% WO3, MnO2 and CaO to Ba4 (Sm0.6, Nd0.4)9.33Ti18O54 and Ba3.75(Sm0.5, Nd0.5)9.5Ti18O54 was studied. It was found that these two compositions lead to dense ceramics exhibiting excellent microwave properties, for instance ɛ=74–81, Q × f up to 9000 Ghz at 3 Ghz and τf around +9 p.p.m.°C−1.

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Author notes

  1. P. Laffez

    Present address: Superconductivity Research Laboratory, International Superconductivity Technology Center, Shinonome 1-10-1, Koto-Ku, 135, Tokyo, Japan

Authors and Affiliations

  1. Laboratoire de Cristallographie et Sciences des Materiaux, Institut des Sciences de la Matiere et du Rayonement-ISMRA, Boulevard du Maréchal Juin, 14050, Caen Cedex, France

    P. Laffez, G. Desgardin & B. Raveau

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  1. P. Laffez
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  2. G. Desgardin
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  3. B. Raveau
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Laffez, P., Desgardin, G. & Raveau, B. Microwave dielectric properties of doped Ba6−x(Sm1−y′Ndy)8+2x/3Ti18O54 oxides. JOURNAL OF MATERIALS SCIENCE 30, 267–273 (1995). https://doi.org/10.1007/BF00352161

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