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Phase Formation, Structure, and Dielectric Properties of Modified Potassium Sodium Niobate Ceramics

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Inorganic Materials Aims and scope

Abstract—

We have prepared (1 – x)(K0.5Na0.5)NbO3–xCa(Cu1/3Nb2/3)O3 (x = 0–0.1, ∆х = 0.02) ceramics by solid-state reactions and studied their phase formation, structure, and dielectric and ferroelectric properties. The formation of a phase with the perovskite structure and an orthorhombic unit cell has been demonstrated in all of the samples. Ferroelectric phase transitions have been confirmed by dielectric spectroscopy and laser second harmonic generation measurements. The temperatures of the phase transitions from the orthorhombic ferroelectric phase to the tetragonal ferroelectric phase and to the cubic (paraelectric) phase have been shown to decrease with increasing x. We have analyzed the composition dependences of dielectric parameters in the system studied.

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Funding

This work was supported by the Russian Foundation for Basic Research (project no. 18-03-00372) and the Russian Federation Ministry of Science and Higher Education (state research target for the Semenov Federal Research Center for Chemical Physics, theme no. 45.22: Fundamental Principles behind the Development of a New Generation of Nanostructured Systems with Unique Electrical and Magnetic Performance Parameters, state registration no. AAAA-A18-118012390045-2).

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Authors and Affiliations

  1. Semenov Federal Research Center for Chemical Physics, 119991, Moscow, Russia

    G. M. Kaleva & E. D. Politova

  2. Moscow State University, 119991, Moscow, Russia

    A. V. Mosunov & S. Yu. Stefanovich

Authors
  1. G. M. Kaleva
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  2. E. D. Politova
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  3. A. V. Mosunov
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  4. S. Yu. Stefanovich
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Correspondence to G. M. Kaleva.

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Translated by O. Tsarev

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Kaleva, G.M., Politova, E.D., Mosunov, A.V. et al. Phase Formation, Structure, and Dielectric Properties of Modified Potassium Sodium Niobate Ceramics. Inorg Mater 56, 1072–1078 (2020). https://doi.org/10.1134/S0020168520100076

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  • DOI: https://doi.org/10.1134/S0020168520100076

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