TY - JOUR

T1 - Novel Ni-Doped Bismuth-Magnesium Tantalate Pyrochlores

T2 - Structural and Electrical Properties, Thermal Expansion, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectra

AU - Zhuk, Nadezhda A.

AU - Krzhizhanovskaya, Maria G.

AU - Sekushin, Nikolay A.

AU - Kharton, Vladislav V.

AU - Koroleva, Alexandra V.

AU - Nekipelov, Sergey V.

AU - Sivkov, Danil V.

AU - Sivkov, Viktor N.

AU - Makeev, Boris A.

AU - Lebedev, Alexey M.

AU - Chumakov, Ratibor G.

AU - Kovalenko, Sofia Yu

N1 - Publisher Copyright: © 2021 The Authors. Published by American Chemical Society.

PY - 2021/9/14

Y1 - 2021/9/14

N2 - The samples of Ni-doped bismuth magnesium tantalate pyrochlores with the general formula Bi1.4(Mg1-xNix)0.7Ta1.4O6.3 (x = 0.3, 0.5, 0.7) were obtained by solid-phase synthesis. The crystal structure of the pyrochlore type (sp. gr. Fd3¯ m: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 200-106 Hz and at temperatures 100-450 °C were not detected.

AB - The samples of Ni-doped bismuth magnesium tantalate pyrochlores with the general formula Bi1.4(Mg1-xNix)0.7Ta1.4O6.3 (x = 0.3, 0.5, 0.7) were obtained by solid-phase synthesis. The crystal structure of the pyrochlore type (sp. gr. Fd3¯ m: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 200-106 Hz and at temperatures 100-450 °C were not detected.

KW - SUBSOLIDUS PHASE-EQUILIBRIA

KW - DIELECTRIC-PROPERTIES

KW - ELECTRONIC-STRUCTURE

KW - OPTICAL-PROPERTIES

KW - SYSTEM

KW - CERAMICS

KW - BEHAVIOR

KW - XPS

KW - CONDUCTIVITY

KW - RELAXATION

UR - http://www.scopus.com/inward/record.url?scp=85114673988&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/da919fd0-7f4e-3e63-abb0-90d435242b8e/

U2 - 10.1021/acsomega.1c02969

DO - 10.1021/acsomega.1c02969

M3 - Article

C2 - 34549126

AN - SCOPUS:85114673988

VL - 6

SP - 23262

EP - 23273

JO - ACS Omega

JF - ACS Omega

SN - 2470-1343

IS - 36

ER -