Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties
High-entropy effect is a novel design strategy to optimize properties and explore novel materials. In this work, (La1/5Nd1/5Sm1/5Ho1/5Y1/5)NbO4 (5RNO) high-entropy microwave dielectric ceramics were successfully prepared in the sintering temperature (S.T.) range of 1210–1290 ℃ via a solid-phase reac...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2023-05-01
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| Series: | Journal of Advanced Ceramics |
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| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2023.9220739 |
| _version_ | 1797801038675181568 |
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| author | Deqin Chen Na Yan Xuefeng Cao Fengrong Li Laijun Liu Qinghua Shen Huanfu Zhou Chunchun Li |
| author_facet | Deqin Chen Na Yan Xuefeng Cao Fengrong Li Laijun Liu Qinghua Shen Huanfu Zhou Chunchun Li |
| author_sort | Deqin Chen |
| collection | DOAJ |
| description | High-entropy effect is a novel design strategy to optimize properties and explore novel materials. In this work, (La1/5Nd1/5Sm1/5Ho1/5Y1/5)NbO4 (5RNO) high-entropy microwave dielectric ceramics were successfully prepared in the sintering temperature (S.T.) range of 1210–1290 ℃ via a solid-phase reaction route, and medium-entropy (La1/3Nd1/3Sm1/3)NbO4 and (La1/4Nd1/4Sm1/4Ho1/4)NbO4 (3RNO and 4RNO) ceramics were compared. The effects of the entropy (S) on crystal structure, phase transition, and dielectric performance were evaluated. The entropy increase yields a significant increase in a phase transition temperature (from monoclinic fergusonite to tetragonal scheelite structure). Optimal microwave dielectric properties were achieved in the high-entropy ceramics (5RNO) at the sintering temperature of 1270 ℃ for 4 h with a relative density of 98.2% and microwave dielectric properties of dielectric permittirity (εr) = 19.48, quality factor (Q×f) = 47,770 GHz, and resonant frequency temperature coefficient (τf) = –13.50 ppm/℃. This work opens an avenue for the exploration of novel microwave dielectric material and property optimization via entropy engineering. |
| first_indexed | 2024-03-13T04:44:20Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2226-4108 2227-8508 |
| language | English |
| last_indexed | 2024-03-13T04:44:20Z |
| publishDate | 2023-05-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj.art-529f357b07374330a2b7919c07c132a62023-06-19T03:59:28ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082023-05-011251067108010.26599/JAC.2023.9220739Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric propertiesDeqin Chen0Na Yan1Xuefeng Cao2Fengrong Li3Laijun Liu4Qinghua Shen5Huanfu Zhou6Chunchun Li7Guangxi University Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaGuangxi University Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaGuangxi University Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaGuangxi University Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaGuangxi University Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Embedded Technology and Intelligent System, Guilin University of Technology, Guilin 541004, ChinaGuangxi University Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaGuangxi University Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaHigh-entropy effect is a novel design strategy to optimize properties and explore novel materials. In this work, (La1/5Nd1/5Sm1/5Ho1/5Y1/5)NbO4 (5RNO) high-entropy microwave dielectric ceramics were successfully prepared in the sintering temperature (S.T.) range of 1210–1290 ℃ via a solid-phase reaction route, and medium-entropy (La1/3Nd1/3Sm1/3)NbO4 and (La1/4Nd1/4Sm1/4Ho1/4)NbO4 (3RNO and 4RNO) ceramics were compared. The effects of the entropy (S) on crystal structure, phase transition, and dielectric performance were evaluated. The entropy increase yields a significant increase in a phase transition temperature (from monoclinic fergusonite to tetragonal scheelite structure). Optimal microwave dielectric properties were achieved in the high-entropy ceramics (5RNO) at the sintering temperature of 1270 ℃ for 4 h with a relative density of 98.2% and microwave dielectric properties of dielectric permittirity (εr) = 19.48, quality factor (Q×f) = 47,770 GHz, and resonant frequency temperature coefficient (τf) = –13.50 ppm/℃. This work opens an avenue for the exploration of novel microwave dielectric material and property optimization via entropy engineering.https://www.sciopen.com/article/10.26599/JAC.2023.9220739high-entropy ceramicsmicrowave dielectric propertyion disorderfar-infrared |
| spellingShingle | Deqin Chen Na Yan Xuefeng Cao Fengrong Li Laijun Liu Qinghua Shen Huanfu Zhou Chunchun Li Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties Journal of Advanced Ceramics high-entropy ceramics microwave dielectric property ion disorder far-infrared |
| title | Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties |
| title_full | Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties |
| title_fullStr | Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties |
| title_full_unstemmed | Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties |
| title_short | Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties |
| title_sort | entropy regulation in lanbo4 based fergusonite to implement high temperature phase transition and promising dielectric properties |
| topic | high-entropy ceramics microwave dielectric property ion disorder far-infrared |
| url | https://www.sciopen.com/article/10.26599/JAC.2023.9220739 |
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