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Dielectric properties of Sr3CuNb2O9 perovskite ceramics

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Abstract

The dielectric constant ɛ and loss tangent tanδ of Sr3CuNb2O9 perovskite ceramics prepared by solid-state reactions have been measured at temperatures from 300 to 900 K and frequencies from 25 to 1 × 106 Hz. The results demonstrate that the samples slowly cooled from the temperature of the final, high-temperature firing (1200°C) have relatively low permittivity (ɛ ≃ 10) and dielectric losses (tanδ ≃ 0.005 at 1 kHz) at room temperature, with no strong dielectric dispersion and no prominent maxima in the temperature dependences of their permittivity and dielectric loss. The ceramics quenched from 1300°C exhibit a pronounced Debye-type low-frequency relaxation and strong dielectric dispersion in conjunction with high permittivity ɛ ≃ 2000 at low frequencies and/or high temperatures. The observed dielectric anomalies in the Sr3CuNb2O9 ceramics can be understood in terms of Maxwell-Wagner relaxation at dielectric inhomogeneities associated with the quenching-induced difference in oxygen-vacancy concentration between the grain bulk and surface layer.

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Authors and Affiliations

  1. Moscow State Institute of Radio Engineering, Electronics, and Automation (Technical University), pr. Vernadskogo 78, Moscow, 119454, Russia

    A. A. Bush & V. P. Sirotinkin

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  1. A. A. Bush
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  2. V. P. Sirotinkin
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Correspondence to A. A. Bush.

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Original Russian Text © A.A. Bush, V.P. Sirotinkin, 2008, published in Neorganicheskie Materialy, 2008, Vol. 44, No. 11, pp. 1367–1374.

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Bush, A.A., Sirotinkin, V.P. Dielectric properties of Sr3CuNb2O9 perovskite ceramics. Inorg Mater 44, 1233–1239 (2008). https://doi.org/10.1134/S0020168508110174

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