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Effect of nonstoichiometry on the structure and microwave dielectric properties of cobalt metaniobate

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Abstract

The formation of cobalt metaniobate, CoNb2O6, with the columbite structure has been studied, and possible ways of optimizing solid-state synthesis conditions have been examined. Single-phase CoNb2−y O6−2.5y has been obtained in the composition range 0 ≤ y ≤ 0.05. The microstructure and microwave dielectric properties of Co1−x Nb2O6−x materials have been investigated. The results indicate that the electrical Q of the nonstoichiometric materials drops sharply for x > 0 because of the presence of Nb2O5 as an impurity phase. For x < 0, Q gradually decreases with increasing Co content, which is caused by the rise in lattice strain and presence of Co4Nb2O9 impurity.

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Authors and Affiliations

  1. Vernadsky Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine, pr. Akademika Palladina 32/34, Kiev, 03680, Ukraine

    A. G. Belous, O. V. Ovchar, A. V. Kramarenko & D. O. Mishchuk

  2. Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia

    Bostjan Jancar, Jana Bezjak & Danilo Suvorov

Authors
  1. A. G. Belous
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  2. O. V. Ovchar
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  3. A. V. Kramarenko
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  4. D. O. Mishchuk
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  5. Bostjan Jancar
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  6. Jana Bezjak
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  7. Danilo Suvorov
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Original Russian Text © A.G. Belous, O.V. Ovchar, A.V. Kramarenko, D.O. Mishchuk, Bostjan Jancar, Jana Bezjak, Danilo Suvorov, 2006, published in Neorganicheskie Materialy, 2006, Vol. 42, No. 12, pp. 1498–1502.

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Belous, A.G., Ovchar, O.V., Kramarenko, A.V. et al. Effect of nonstoichiometry on the structure and microwave dielectric properties of cobalt metaniobate. Inorg Mater 42, 1369–1373 (2006). https://doi.org/10.1134/S0020168506120156

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  • DOI: https://doi.org/10.1134/S0020168506120156

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