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Journal of Advanced Ceramics 2023, 12(5): 1067-1080 https://doi.org/10.26599/JAC.2023.9220739
Research Article | Open Access | Issue | Published: 15 April 2023

Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties

Show Author's Information Deqin Chena,  Na Yana,  Xuefeng Caoa,  Fengrong Lia,  Laijun Liua,  Qinghua Shenb,  Huanfu Zhoua,  Chunchun Lia,b( )
Guangxi 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, China
Guangxi Key Laboratory of Embedded Technology and Intelligent System, Guilin University of Technology, Guilin 541004, China
Keywords:
high-entropy ceramics, microwave dielectric property, ion disorder, far-infrared
Cite this article:
Chen D, Yan N, Cao X, et al. Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties. Journal of Advanced Ceramics, 2023, 12(5): 1067-1080. https://doi.org/10.26599/JAC.2023.9220739
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Abstract Full text About this article

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.


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About this article

Entropy regulation in LaNbO4-based fergusonite to implement high-temperature phase transition and promising dielectric properties

Show Author's information Deqin Chena, Na Yana, Xuefeng Caoa, Fengrong Lia, Laijun Liua, Qinghua Shenb, Huanfu Zhoua, Chunchun Lia,b( )
Guangxi 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, China
Guangxi Key Laboratory of Embedded Technology and Intelligent System, Guilin University of Technology, Guilin 541004, China

Abstract

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.

Keywords: high-entropy ceramics, microwave dielectric property, ion disorder, far-infrared

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Publication history

Received: 10 November 2022
Revised: 01 March 2023
Accepted: 01 March 2023
Published: 15 April 2023
Issue date: May 2023

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© The Author(s) 2023.

Acknowledgements

Chunchun Li gratefully acknowledges the Fundamental Research Funds of Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices (No. AFMD-KFJJ-21210) and the financial support from the National Natural Science Foundation of China (No. 62061011) and Guangxi Key Laboratory Fund of Embedded Technology and Intelligent System (No. 2020-1-6).

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