Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies
Zn[CrGa(₁-ⅹ)]₂O₄ (abbreviated Cr-ZGO) ceramics with x = 0–0.15 were synthesized by the conventional solid state method. The correlation between the microwave dielectric properties and the changes in the crystal structure and cation distribution of Cr-ZGO as a function of Cr³⁺ substitution for Ga3...
| Главные авторы: | , , , , , |
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| Другие авторы: | |
| Формат: | Journal Article |
| Язык: | English |
| Опубликовано: |
2021
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| Предметы: | |
| Online-ссылка: | https://hdl.handle.net/10356/151490 |
| _version_ | 1826121186522693632 |
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| author | Lu, Xiaochi Du, Zehui Quan, Bin Bian, Wenjie Zhu, Haikui Zhang, Qitu |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Lu, Xiaochi Du, Zehui Quan, Bin Bian, Wenjie Zhu, Haikui Zhang, Qitu |
| author_sort | Lu, Xiaochi |
| collection | NTU |
| description | Zn[CrGa(₁-ⅹ)]₂O₄ (abbreviated Cr-ZGO) ceramics with x = 0–0.15 were synthesized by the conventional
solid state method. The correlation between the microwave dielectric properties and the changes in the
crystal structure and cation distribution of Cr-ZGO as a function of Cr³⁺ substitution for Ga3+ has been
systematically investigated. The addition of Cr³⁺ promotes the densification of the ceramics and results
in a normal spinel structure with Cr³⁺ occupying an octahedral site. With an increase in the Cr3+ content
from 0 to 15 mol%, the er of the ceramics increases, while the tf remains almost unchanged and the
Q f values ramp up to a maximum at 1 mol% Cr³⁺ addition and then ramp down continuously.
1Cr-ZGO exhibits the best microwave dielectric properties, with er, Q f, tand and tf being 9.88 (@9.9 GHz),
111 470 GHz, 8.87, and 74 ppm ⁰C-¹
, respectively. The Q f value was increased by almost 40%
compared with the pure ZGO ceramics (B80 000 GHz). The enhancement of er and Q f values of
Cr-ZGO can be attributed to the better bulk density, but further analysis by Rietveld refinement, Raman
spectroscopy and FT-IR spectroscopy elucidated that the octahedral tilting in the spinel structure and
the degree of short-range cation distribution are other governing factors. The effect of Cr³⁺ substitution
for Ga³⁺ on the octahedral distortion and cation distribution in the spinel structure has been discussed
in detail. |
| first_indexed | 2024-10-01T05:28:35Z |
| format | Journal Article |
| id | ntu-10356/151490 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:28:35Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1514902021-06-17T02:50:32Z Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies Lu, Xiaochi Du, Zehui Quan, Bin Bian, Wenjie Zhu, Haikui Zhang, Qitu School of Materials Science and Engineering Temasek Laboratories @ NTU Engineering::Materials Ceramic Materials Crystal Structure Zn[CrGa(₁-ⅹ)]₂O₄ (abbreviated Cr-ZGO) ceramics with x = 0–0.15 were synthesized by the conventional solid state method. The correlation between the microwave dielectric properties and the changes in the crystal structure and cation distribution of Cr-ZGO as a function of Cr³⁺ substitution for Ga3+ has been systematically investigated. The addition of Cr³⁺ promotes the densification of the ceramics and results in a normal spinel structure with Cr³⁺ occupying an octahedral site. With an increase in the Cr3+ content from 0 to 15 mol%, the er of the ceramics increases, while the tf remains almost unchanged and the Q f values ramp up to a maximum at 1 mol% Cr³⁺ addition and then ramp down continuously. 1Cr-ZGO exhibits the best microwave dielectric properties, with er, Q f, tand and tf being 9.88 (@9.9 GHz), 111 470 GHz, 8.87, and 74 ppm ⁰C-¹ , respectively. The Q f value was increased by almost 40% compared with the pure ZGO ceramics (B80 000 GHz). The enhancement of er and Q f values of Cr-ZGO can be attributed to the better bulk density, but further analysis by Rietveld refinement, Raman spectroscopy and FT-IR spectroscopy elucidated that the octahedral tilting in the spinel structure and the degree of short-range cation distribution are other governing factors. The effect of Cr³⁺ substitution for Ga³⁺ on the octahedral distortion and cation distribution in the spinel structure has been discussed in detail. Financial support from the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the Opening Project of the State Key Laboratory of HighPerformance Ceramics and Superfine Microstructure (project no. SKL201309SIC), the College Industrialization Project of Jiangsu Province (JHB2012-12), the Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, the Science and Technology Projects of Guangdong Province (project no. 2011A091103002), Graduate Student Training Innovation Project in Jiangsu province (KYCX17_0973), and China Scholarship Council (No. 201808320360) is acknowledged. 2021-06-17T02:50:32Z 2021-06-17T02:50:32Z 2019 Journal Article Lu, X., Du, Z., Quan, B., Bian, W., Zhu, H. & Zhang, Q. (2019). Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies. Journal of Materials Chemistry C, 7(27), 8261-8268. https://dx.doi.org/10.1039/C9TC01959F 2050-7526 https://hdl.handle.net/10356/151490 10.1039/C9TC01959F 27 7 8261 8268 en Journal of Materials Chemistry C © 2019 The Royal Society of Chemistry. All rights reserved. |
| spellingShingle | Engineering::Materials Ceramic Materials Crystal Structure Lu, Xiaochi Du, Zehui Quan, Bin Bian, Wenjie Zhu, Haikui Zhang, Qitu Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies |
| title | Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies |
| title_full | Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies |
| title_fullStr | Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies |
| title_full_unstemmed | Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies |
| title_short | Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄ spinel ceramics : crystal distortion and vibration mode studies |
| title_sort | structural dependence of the microwave dielectric properties of cr³⁺ substituted znga₂o₄ spinel ceramics crystal distortion and vibration mode studies |
| topic | Engineering::Materials Ceramic Materials Crystal Structure |
| url | https://hdl.handle.net/10356/151490 |
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