Doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate pyrochlores
Here we report the doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate (BMCN) pyrochlores synthesised using solid-state reaction at 1025 °C over 24–48 h. The extensive solid solution of (Bi3.36Mg0.64-xCax)(Mg1.28Nb2.72)O13.76 (0 ≤ x ≤ 0.7) pyrochlores formed with a full...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020
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| Online Access: | http://psasir.upm.edu.my/id/eprint/88525/1/ABSTRACT.pdf |
| _version_ | 1825936530867224576 |
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| author | Mat Dasin, Nurul Aidayu Tan, Kar Ban Khaw, Chwin Chieh Zainal, Zulkarnain Lee, Onn Jew Chen, Soo Kien |
| author_facet | Mat Dasin, Nurul Aidayu Tan, Kar Ban Khaw, Chwin Chieh Zainal, Zulkarnain Lee, Onn Jew Chen, Soo Kien |
| author_sort | Mat Dasin, Nurul Aidayu |
| collection | UPM |
| description | Here we report the doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate (BMCN) pyrochlores synthesised using solid-state reaction at 1025 °C over 24–48 h. The extensive solid solution of (Bi3.36Mg0.64-xCax)(Mg1.28Nb2.72)O13.76 (0 ≤ x ≤ 0.7) pyrochlores formed with a fully indexed cubic structure, space group Fd3m and lattice constants, a = b = c in the range 10.5621 (17)−10.5332 (14) Å. The SEM analysis confirmed that the surface morphologies of BMCN pyrochlores were of irregular polyhedral grains and their crystallite sizes, as calculated by Scherrer and Williamson-Hall methods, were found to be in the range 46–70 nm and 38–75 nm, respectively. These thermally stable BMCN pyrochlores were highly insulating materials that showed a reproducible dielectric behaviour over heat-cool cycles and their activation energies were estimated to be in the range 1.17–1.47 eV. High bulk dielectric constants, ε’, 69–171 and low dielectric losses, tan δ, in the order of ~10⁻³ were recorded at 30 °C and 1 MHz; negative temperature coefficient of capacitance (TCC) in the range, (−319)−(-933) ppm/°C was measured over ~30–300 °C at 1 MHz. |
| first_indexed | 2024-03-06T10:45:42Z |
| format | Article |
| id | upm.eprints-88525 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T10:45:42Z |
| publishDate | 2020 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | upm.eprints-885252021-12-22T08:58:45Z http://psasir.upm.edu.my/id/eprint/88525/ Doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate pyrochlores Mat Dasin, Nurul Aidayu Tan, Kar Ban Khaw, Chwin Chieh Zainal, Zulkarnain Lee, Onn Jew Chen, Soo Kien Here we report the doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate (BMCN) pyrochlores synthesised using solid-state reaction at 1025 °C over 24–48 h. The extensive solid solution of (Bi3.36Mg0.64-xCax)(Mg1.28Nb2.72)O13.76 (0 ≤ x ≤ 0.7) pyrochlores formed with a fully indexed cubic structure, space group Fd3m and lattice constants, a = b = c in the range 10.5621 (17)−10.5332 (14) Å. The SEM analysis confirmed that the surface morphologies of BMCN pyrochlores were of irregular polyhedral grains and their crystallite sizes, as calculated by Scherrer and Williamson-Hall methods, were found to be in the range 46–70 nm and 38–75 nm, respectively. These thermally stable BMCN pyrochlores were highly insulating materials that showed a reproducible dielectric behaviour over heat-cool cycles and their activation energies were estimated to be in the range 1.17–1.47 eV. High bulk dielectric constants, ε’, 69–171 and low dielectric losses, tan δ, in the order of ~10⁻³ were recorded at 30 °C and 1 MHz; negative temperature coefficient of capacitance (TCC) in the range, (−319)−(-933) ppm/°C was measured over ~30–300 °C at 1 MHz. Elsevier 2020 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/88525/1/ABSTRACT.pdf Mat Dasin, Nurul Aidayu and Tan, Kar Ban and Khaw, Chwin Chieh and Zainal, Zulkarnain and Lee, Onn Jew and Chen, Soo Kien (2020) Doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate pyrochlores. Materials Chemistry and Physics, 242 (8). pp. 1-11. ISSN 0254-0584 https://www.sciencedirect.com/science/article/pii/S0254058419313689 10.1016/j.matchemphys.2019.122558 |
| spellingShingle | Mat Dasin, Nurul Aidayu Tan, Kar Ban Khaw, Chwin Chieh Zainal, Zulkarnain Lee, Onn Jew Chen, Soo Kien Doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate pyrochlores |
| title | Doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate pyrochlores |
| title_full | Doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate pyrochlores |
| title_fullStr | Doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate pyrochlores |
| title_full_unstemmed | Doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate pyrochlores |
| title_short | Doping mechanisms and dielectric properties of Ca-doped bismuth magnesium niobate pyrochlores |
| title_sort | doping mechanisms and dielectric properties of ca doped bismuth magnesium niobate pyrochlores |
| url | http://psasir.upm.edu.my/id/eprint/88525/1/ABSTRACT.pdf |
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