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Novel Ni-Doped Bismuth–Magnesium Tantalate Pyrochlores: Structural and Electrical Properties, Thermal Expansion, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectra

[Image: see text] The samples of Ni-doped bismuth magnesium tantalate pyrochlores with the general formula Bi(1.4)(Mg(1–x)Ni(x))(0.7)Ta(1.4)O(6.3) (x = 0.3, 0.5, 0.7) were obtained by solid-phase synthesis. The crystal structure of the pyrochlore type (sp. gr. Fd3̅m:2) was clarified by the Rietveld...

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Autores principales: Zhuk, Nadezhda A., Krzhizhanovskaya, Maria G., Sekushin, Nikolay A., Kharton, Vladislav V., Koroleva, Alexandra V., Nekipelov, Sergey V., Sivkov, Danil V., Sivkov, Viktor N., Makeev, Boris A., Lebedev, Alexey M., Chumakov, Ratibor G., Kovalenko, Sofia Yu.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8444297/
https://www.ncbi.nlm.nih.gov/pubmed/34549126
http://dx.doi.org/10.1021/acsomega.1c02969
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author Zhuk, Nadezhda A.
Krzhizhanovskaya, Maria G.
Sekushin, Nikolay A.
Kharton, Vladislav V.
Koroleva, Alexandra V.
Nekipelov, Sergey V.
Sivkov, Danil V.
Sivkov, Viktor N.
Makeev, Boris A.
Lebedev, Alexey M.
Chumakov, Ratibor G.
Kovalenko, Sofia Yu.
author_facet Zhuk, Nadezhda A.
Krzhizhanovskaya, Maria G.
Sekushin, Nikolay A.
Kharton, Vladislav V.
Koroleva, Alexandra V.
Nekipelov, Sergey V.
Sivkov, Danil V.
Sivkov, Viktor N.
Makeev, Boris A.
Lebedev, Alexey M.
Chumakov, Ratibor G.
Kovalenko, Sofia Yu.
author_sort Zhuk, Nadezhda A.
collection PubMed
description [Image: see text] The samples of Ni-doped bismuth magnesium tantalate pyrochlores with the general formula Bi(1.4)(Mg(1–x)Ni(x))(0.7)Ta(1.4)O(6.3) (x = 0.3, 0.5, 0.7) were obtained by solid-phase synthesis. The crystal structure of the pyrochlore type (sp. gr. Fd3̅m:2) was clarified by the Rietveld method on the basis of X-ray powder diffraction data. The unit cell parameters increase with the decreasing nickel content in the range from 10.5319(1) to 10.5391(1) Å. The electronic state of atoms is established by the XPS method. According to XPS analysis, bismuth atoms have an effective charge of +3, nickel atoms +(2 + δ), and tantalum ions +(5 – δ). The coefficient of thermal expansion of the lattice of the samples was calculated from high-temperature X-ray structural measurements in the range of −180 to 1050 °C. The average values of linear TECs α in the temperature ranges of 30–570 and 600–1050 °C are 5.1 × 10(–6) and 8.1 × 10(–6) °C(–1), respectively. The monotonicity of the change in the thermal expansion coefficient in the temperature range from −100 to 1050 °C indicates the absence of phase transformations. All samples are dielectric and exhibit high activation energies ∼2.0 eV, moderately high dielectric constants ∼24–28, and tangent dielectric losses ∼0.002 at 1 MHz and 21 °C. The electrical properties of the samples are described by a simple parallel equivalent scheme. The chemical composition of the materials has little effect on the polarizability of the medium or on the value of the activation energy of the conductivity. Ionic processes in investigated materials at frequencies 200–10(6) Hz and at temperatures 100–450 °C were not detected.
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spelling pubmed-84442972021-09-20 Novel Ni-Doped Bismuth–Magnesium Tantalate Pyrochlores: Structural and Electrical Properties, Thermal Expansion, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectra Zhuk, Nadezhda A. Krzhizhanovskaya, Maria G. Sekushin, Nikolay A. Kharton, Vladislav V. Koroleva, Alexandra V. Nekipelov, Sergey V. Sivkov, Danil V. Sivkov, Viktor N. Makeev, Boris A. Lebedev, Alexey M. Chumakov, Ratibor G. Kovalenko, Sofia Yu. ACS Omega [Image: see text] The samples of Ni-doped bismuth magnesium tantalate pyrochlores with the general formula Bi(1.4)(Mg(1–x)Ni(x))(0.7)Ta(1.4)O(6.3) (x = 0.3, 0.5, 0.7) were obtained by solid-phase synthesis. The crystal structure of the pyrochlore type (sp. gr. Fd3̅m:2) was clarified by the Rietveld method on the basis of X-ray powder diffraction data. The unit cell parameters increase with the decreasing nickel content in the range from 10.5319(1) to 10.5391(1) Å. The electronic state of atoms is established by the XPS method. According to XPS analysis, bismuth atoms have an effective charge of +3, nickel atoms +(2 + δ), and tantalum ions +(5 – δ). The coefficient of thermal expansion of the lattice of the samples was calculated from high-temperature X-ray structural measurements in the range of −180 to 1050 °C. The average values of linear TECs α in the temperature ranges of 30–570 and 600–1050 °C are 5.1 × 10(–6) and 8.1 × 10(–6) °C(–1), respectively. The monotonicity of the change in the thermal expansion coefficient in the temperature range from −100 to 1050 °C indicates the absence of phase transformations. All samples are dielectric and exhibit high activation energies ∼2.0 eV, moderately high dielectric constants ∼24–28, and tangent dielectric losses ∼0.002 at 1 MHz and 21 °C. The electrical properties of the samples are described by a simple parallel equivalent scheme. The chemical composition of the materials has little effect on the polarizability of the medium or on the value of the activation energy of the conductivity. Ionic processes in investigated materials at frequencies 200–10(6) Hz and at temperatures 100–450 °C were not detected. American Chemical Society 2021-08-30 /pmc/articles/PMC8444297/ /pubmed/34549126 http://dx.doi.org/10.1021/acsomega.1c02969 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Zhuk, Nadezhda A.
Krzhizhanovskaya, Maria G.
Sekushin, Nikolay A.
Kharton, Vladislav V.
Koroleva, Alexandra V.
Nekipelov, Sergey V.
Sivkov, Danil V.
Sivkov, Viktor N.
Makeev, Boris A.
Lebedev, Alexey M.
Chumakov, Ratibor G.
Kovalenko, Sofia Yu.
Novel Ni-Doped Bismuth–Magnesium Tantalate Pyrochlores: Structural and Electrical Properties, Thermal Expansion, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectra
title Novel Ni-Doped Bismuth–Magnesium Tantalate Pyrochlores: Structural and Electrical Properties, Thermal Expansion, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectra
title_full Novel Ni-Doped Bismuth–Magnesium Tantalate Pyrochlores: Structural and Electrical Properties, Thermal Expansion, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectra
title_fullStr Novel Ni-Doped Bismuth–Magnesium Tantalate Pyrochlores: Structural and Electrical Properties, Thermal Expansion, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectra
title_full_unstemmed Novel Ni-Doped Bismuth–Magnesium Tantalate Pyrochlores: Structural and Electrical Properties, Thermal Expansion, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectra
title_short Novel Ni-Doped Bismuth–Magnesium Tantalate Pyrochlores: Structural and Electrical Properties, Thermal Expansion, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectra
title_sort novel ni-doped bismuth–magnesium tantalate pyrochlores: structural and electrical properties, thermal expansion, x-ray photoelectron spectroscopy, and near-edge x-ray absorption fine structure spectra
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8444297/
https://www.ncbi.nlm.nih.gov/pubmed/34549126
http://dx.doi.org/10.1021/acsomega.1c02969
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