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Influence of Bi substitution on microwave dielectric properties of BaO–La2O3–Sm2O3–TiO2 ceramics

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Abstract

The influences of Bi substitution on microwave dielectric properties of Ba4(La0.5Sm0.5)9.33Ti18O54 solid solutions were investigated. Dielectric ceramics with general formula Ba4(La(0.5−z)Sm0.5Bi z )9.33Ti18O54, z = 0.0–0.2 were prepared by conventional solid state route. The structural analysis of all the samples was carried out by X-ray diffraction and scanning electron microscopy. The dielectric properties were investigated as a function of Bi contents using open-ended coaxial probe method in the frequency range 0.3–3.0 GHz at room temperature. Dielectric constant varies from 83 to 88 and loss tangent from 2.1 × 10−3 to 5.5 × 10−3 at 3 GHz with temperature coefficient of resonant frequency changing from 106.7 to −8.4 ppm/ºC as Bi contents increases from z = 0.00–0.20. It has been found that dielectric constant and temperature coefficient of resonant frequency improve whereas loss tangent is adversely affected with increase in Bi substitution.

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Acknowledgments

The authors are thankful to SAIF, Punjab University, Chandigarh, India for XRD and SEM facility and also to Dr A. Banerjee, UGC-DAE CSR, Indore for providing the facility to study the dielectric properties as a function of temperature.

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Authors and Affiliations

  1. Department of Electronics Technology, Guru Nanak Dev University, Amritsar, India

    S. Bindra Narang & Shalini Bahel

  2. UGC-DAE Consortium for Scientific Research, Indore, India

    S. Dash

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  1. S. Bindra Narang
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  2. Shalini Bahel
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  3. S. Dash
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Correspondence to S. Bindra Narang.

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Bindra Narang, S., Bahel, S. & Dash, S. Influence of Bi substitution on microwave dielectric properties of BaO–La2O3–Sm2O3–TiO2 ceramics. J Mater Sci: Mater Electron 21, 1186–1190 (2010). https://doi.org/10.1007/s10854-009-0044-8

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  • DOI: https://doi.org/10.1007/s10854-009-0044-8

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