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Research Article | Open Access

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

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
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Graphical Abstract

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 ceramicsmicrowave dielectric propertyion disorderfar-infrared

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Journal of Advanced Ceramics
Volume 12 Issue 5,
May 2023
Pages 1067-1080
DOI: 10.26599/JAC.2023.9220739
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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Received: 10 November 2022
Revised: 01 March 2023
Accepted: 01 March 2023
Published: 15 April 2023
© The Author(s) 2023.

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