Synthesis, Optical and Electrical Properties of High-Entropy Niobate (Mg0.2Cu0.2Ni0.2Co0.2Zn0.2)Nb2O6 with Columbite Structure

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Abstract

The high-entropy niobate (Mg0.2Cu0.2Ni0.2Co0.2Zn0.2)Nb2O6 with a columbite structure was synthesized for the first time. A modified method of combustion solutions followed by high-temperature sintering was used. According to the diffuse reflectance spectra, the band gap of the direct electronic transition is 3.36 eV. Mixed electronic-ionic conductivity was determined. The total conductivity of the sample is 2.5 · 10–3 S/cm at 750°C and is comparable to Mg0.8Cu0.2Nb2O6.

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About the authors

M. S. Koroleva

Institute of Chemistry of the Komi Science Center of the Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: marikorolevas@gmail.com
Russian Federation, Syktyvkar, 167000

V. S. Maksimov

Institute of Chemistry of the Komi Science Center of the Ural Branch of the Russian Academy of Sciences; Pitirim Sorokin Syktyvkar State University

Email: marikorolevas@gmail.com
Russian Federation, Syktyvkar, 167000; Syktyvkar, 167005

I. V. Piir

Institute of Chemistry of the Komi Science Center of the Ural Branch of the Russian Academy of Sciences

Email: marikorolevas@gmail.com
Russian Federation, Syktyvkar, 167000

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Supplementary files

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2. Fig. 1. Experimental, calculated X-ray diffraction patterns and their difference profile for (Mg0.2Cu0.2Ni0.2Co0.2Zn0.2)Nb2O6.

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3. Fig. 2. Micrograph of the ground surface of high-entropy ceramic (Mg0.2Cu0.2Ni0.2Co0.2Zn0.2)Nb2O6 in the elastically reflected electron mode.

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4. Fig. 3. Absorption spectra and Tautz dependences for direct and indirect allowed electronic transitions (insets) for (Mg0.2Cu0.2Ni0.2Co0.2Zn0.2)Nb2O6.

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5. Fig. 4. Impedance spectra of (Mg0.2Cu0.2Ni0.2Co0.2Zn0.2)Nb2O6 at 25 (a) and 280°C (b) in air.

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6. Fig. 5. DC reverse temperature dependence of conductivity in air (shaded icons) and oxygen (empty icons) for (Mg0.2Cu0.2Ni0.2Co0.2Zn0.2)Nb2O6 versus substituted columbites Mg1-xCuxNb2O6 [29].

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