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Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores

Here we investigated the doping mechanisms and electrical properties of Ba-substituted Bi3.36Mg1.92-xBaxNb2.72O14.36 (BMBN) pyrochlores. Phase-pure BMBN pyrochlores prepared by solid-state reaction were found to crystallise in a cubic structure (Fd3m; No. 227) with their lattice parameters in the ra...

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Main Authors: Mat Dasin, Nurul Aidayu, Tan, Kar Ban, Zainal, Zulkarnain, Khaw, Chwin Chieh, Chen, Soo Kien
Format: Article
Language:English
Published: Springer 2019
Online Access:http://psasir.upm.edu.my/id/eprint/79443/1/Doping%20mechanisms%20and%20impedance%20study%20.pdf
http://psasir.upm.edu.my/id/eprint/79443/
https://link.springer.com/article/10.1007/s10832-019-00188-1
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spelling my.upm.eprints.794432021-04-08T00:21:11Z http://psasir.upm.edu.my/id/eprint/79443/ Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores Mat Dasin, Nurul Aidayu Tan, Kar Ban Zainal, Zulkarnain Khaw, Chwin Chieh Chen, Soo Kien Here we investigated the doping mechanisms and electrical properties of Ba-substituted Bi3.36Mg1.92-xBaxNb2.72O14.36 (BMBN) pyrochlores. Phase-pure BMBN pyrochlores prepared by solid-state reaction were found to crystallise in a cubic structure (Fd3m; No. 227) with their lattice parameters in the range 10.5968(16) - 10.5879(3) Å. The Scanning Electron Microscopy (SEM) analysis revealed that BMBN pyrochlores were composed of irregular shaped grains and their estimated crystallite sizes by both Williamson-Hall and Scherrer methods were in the range 50–75 nm and 60–70 nm, respectively. Neither thermal event nor significant weight loss was observed over the studied temperature range ~30–1000 °C, confirming that BMBN pyrochlores were thermally stable with negligible Bi2O3 loss. The high activation energies in the range 1.18–1.30 eV, as determined by the Arrhenius conductivity plots, showed BMBN pyrochlores to be highly insulating. The dielectric constants, ε’ and dielectric losses, tan δ were found in the range 147–183 and 7.9 × 10−2 - 9.6 × 10−2 at ~30 °C and 1 MHz. Negative temperature coefficient of capacitances, TCC, in the range (−478) - (−688) ppm/°C were recorded over ~30–300 °C at 1 MHz. Springer 2019 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/79443/1/Doping%20mechanisms%20and%20impedance%20study%20.pdf Mat Dasin, Nurul Aidayu and Tan, Kar Ban and Zainal, Zulkarnain and Khaw, Chwin Chieh and Chen, Soo Kien (2019) Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores. Journal of Electroceramics, 43. pp. 41-50. ISSN 1385-3449; ESSN: 1573-8663 https://link.springer.com/article/10.1007/s10832-019-00188-1 10.1007/s10832-019-00188-1
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Here we investigated the doping mechanisms and electrical properties of Ba-substituted Bi3.36Mg1.92-xBaxNb2.72O14.36 (BMBN) pyrochlores. Phase-pure BMBN pyrochlores prepared by solid-state reaction were found to crystallise in a cubic structure (Fd3m; No. 227) with their lattice parameters in the range 10.5968(16) - 10.5879(3) Å. The Scanning Electron Microscopy (SEM) analysis revealed that BMBN pyrochlores were composed of irregular shaped grains and their estimated crystallite sizes by both Williamson-Hall and Scherrer methods were in the range 50–75 nm and 60–70 nm, respectively. Neither thermal event nor significant weight loss was observed over the studied temperature range ~30–1000 °C, confirming that BMBN pyrochlores were thermally stable with negligible Bi2O3 loss. The high activation energies in the range 1.18–1.30 eV, as determined by the Arrhenius conductivity plots, showed BMBN pyrochlores to be highly insulating. The dielectric constants, ε’ and dielectric losses, tan δ were found in the range 147–183 and 7.9 × 10−2 - 9.6 × 10−2 at ~30 °C and 1 MHz. Negative temperature coefficient of capacitances, TCC, in the range (−478) - (−688) ppm/°C were recorded over ~30–300 °C at 1 MHz.
format Article
author Mat Dasin, Nurul Aidayu
Tan, Kar Ban
Zainal, Zulkarnain
Khaw, Chwin Chieh
Chen, Soo Kien
spellingShingle Mat Dasin, Nurul Aidayu
Tan, Kar Ban
Zainal, Zulkarnain
Khaw, Chwin Chieh
Chen, Soo Kien
Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores
author_facet Mat Dasin, Nurul Aidayu
Tan, Kar Ban
Zainal, Zulkarnain
Khaw, Chwin Chieh
Chen, Soo Kien
author_sort Mat Dasin, Nurul Aidayu
title Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores
title_short Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores
title_full Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores
title_fullStr Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores
title_full_unstemmed Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores
title_sort doping mechanisms and impedance study of ba-substituted bismuth magnesium niobate pyrochlores
publisher Springer
publishDate 2019
url http://psasir.upm.edu.my/id/eprint/79443/1/Doping%20mechanisms%20and%20impedance%20study%20.pdf
http://psasir.upm.edu.my/id/eprint/79443/
https://link.springer.com/article/10.1007/s10832-019-00188-1
_version_ 1696977673483452416
score 13.211869

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