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High-temperature impedance and alternating current conduction mechanism of Ni0.5Zn0.5WO4 micro-crystal for electrical energy storage application

High-temperature impedance and alternating current conduction mechanism of Ni0.5Zn0.5WO4... The Ni0.5Zn0.5WO4 crystals were prepared via conventional solid-state synthesis techniques, and its phase formation with monoclinic structure (space group- P2/c) was investigated with a view to understanding its structural, morphological and dielectric properties. The phase formation and average particle size (31.38 μm) were ascertained by X-ray diffractometry and field emission scanning electron microscope techniques, respectively. The real and imaginary impedance ( Z′, Z′′),dielectric constant (ɛr), loss (δ), and ac conductivity (σac) were measured in the frequency range 100 Hz-1 MHz with high-temperature evolution (200–460 °C). The grain, grain boundary and electrode ceramic effect were well fitted with R(RQ)(RQ)(RC) resistor network model using ZSimpWin software. The Non-Debye type dipolar relaxation and NTC effect were observed with high-temperature evolution above 2000c. The dielectric constant and loses were enhances with rising of temperature and ac conductivity was fitted with well-known Jonscher power law. The conduction mechanism was explained with both NSPT and CBH model from the variation of frequency exponent (n) with temperature. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Australian Ceramic Society Springer Journals

High-temperature impedance and alternating current conduction mechanism of Ni0.5Zn0.5WO4 micro-crystal for electrical energy storage application

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Publisher
Springer Journals
Copyright
Copyright © Australian Ceramic Society 2020
ISSN
2510-1560
eISSN
2510-1579
DOI
10.1007/s41779-020-00475-z
Publisher site
See Article on Publisher Site

Abstract

The Ni0.5Zn0.5WO4 crystals were prepared via conventional solid-state synthesis techniques, and its phase formation with monoclinic structure (space group- P2/c) was investigated with a view to understanding its structural, morphological and dielectric properties. The phase formation and average particle size (31.38 μm) were ascertained by X-ray diffractometry and field emission scanning electron microscope techniques, respectively. The real and imaginary impedance ( Z′, Z′′),dielectric constant (ɛr), loss (δ), and ac conductivity (σac) were measured in the frequency range 100 Hz-1 MHz with high-temperature evolution (200–460 °C). The grain, grain boundary and electrode ceramic effect were well fitted with R(RQ)(RQ)(RC) resistor network model using ZSimpWin software. The Non-Debye type dipolar relaxation and NTC effect were observed with high-temperature evolution above 2000c. The dielectric constant and loses were enhances with rising of temperature and ac conductivity was fitted with well-known Jonscher power law. The conduction mechanism was explained with both NSPT and CBH model from the variation of frequency exponent (n) with temperature.

Journal

Journal of the Australian Ceramic SocietySpringer Journals

Published: May 12, 2020

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