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Role of Bi2O3 in optimizing the dielectric properties of Ba4.5Nd9Ti18O54 based microwave ceramics

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Abstract

Small additions of Bi2O3 or bismuth titanate improve the dielectric properties of Ba4.5Nd9Ti18O54 at microwave frequencies. It was found that Bi3+ can replace Nd3+ up to 15 mol%, the limiting composition of solid solution being Ba4.5(Nd0.85Bi0.15)9Ti18O54. At the solid solution limit the temperature coefficient of resonant frequency attains its minimum value. The modified ceramic is distinguished by high permittivity of 99 and a Q-value of 5500. The temperature coefficient of resonant frequency is low, 15 ppm/K. After exceeding the solid solubility limit, additional Bi2O3 concentrates as a Bi-rich phase at the grain boundaries, causing considerable reduction of the Q-value and an increase of τf.

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Authors and Affiliations

  1. Department of Ceramics, “Jožef Stefan” Institute, University of Ljubljana, Ljubljana, Slovenia

    Matjaž Valant, Danilo Suvorov & Drago Kolar

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  1. Matjaž Valant
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  2. Danilo Suvorov
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  3. Drago Kolar
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Valant, M., Suvorov, D. & Kolar, D. Role of Bi2O3 in optimizing the dielectric properties of Ba4.5Nd9Ti18O54 based microwave ceramics. Journal of Materials Research 11, 928–931 (1996). https://doi.org/10.1557/JMR.1996.0116

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  • DOI: https://doi.org/10.1557/JMR.1996.0116

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