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Research Article | Open Access

Influences of substituting of (Ni1/3Nb2/3)4+ for Ti4+ on the phase compositions, microstructures, and dielectric properties of Li2Zn[Ti1−x(Ni1/3Nb2/3)x]3O8 (0 ≤ x ≤ 0.3) microwave ceramics

Jiamao Lia,b( )Zexing WangaYunfeng GuoaSonglin Rana
School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243032, China
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, China
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Abstract

Complex ion substitution is gaining more attention as an appealing method of modifying the structure and performance of microwave ceramics. In this work, Li2Zn[Ti1−x(Ni1/3Nb2/3)x]3O8 (LZTNNx, 0 ≤ x ≤ 0.3) ceramics were designed based on the complex ion substitution strategy, following the substitution rule of radius and valence to investigate the relationship among phase compositions (containing oxygen vacancies and Ti3+ ions), microstructures, and microwave dielectric characteristics of the LZTNNx ceramics. The samples maintained a single Li2ZnTi3O8 solid solution phase as x ≤ 0.2, whereas the sample of x = 0.3 produced a second phase with the LiNbO3 structure. The appropriate amount of (Ni1/3Nb2/3)4+ substitution could slightly improve the densification of the LZTNNx ceramics due to the formation of the Li2ZnTi3O8 solid solution accompanied by a decrease in the average grain size. The presence of a new A1g Raman active band at about 848 cm−1 indicated that local symmetry changed, affecting atomic interactions of the LZTNNx ceramics. The variation of the relative dielectric constant (εr) was closely related to the molar volume ionic polarizability ( αDT), and the temperature coefficient of the resonant frequency (τf) was related to the bond valence (Vi) of Ti. The increase in density, the absence of the Ti3+ ions and oxygen vacancies, and the reduction in damping behavior were responsible for the decreased dielectric loss. The LZTNN0.2 ceramics sintered at 1120 ℃ exhibited favorable microwave dielectric properties: εr = 22.13, quality factor (Q×f) = 97,350 GHz, and τf = −18.60 ppm/℃, which might be a promising candidate for wireless communication applications in highly selective electronics.

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Journal of Advanced Ceramics
Pages 760-777
Cite this article:
Li J, Wang Z, Guo Y, et al. Influences of substituting of (Ni1/3Nb2/3)4+ for Ti4+ on the phase compositions, microstructures, and dielectric properties of Li2Zn[Ti1−x(Ni1/3Nb2/3)x]3O8 (0 ≤ x ≤ 0.3) microwave ceramics. Journal of Advanced Ceramics, 2023, 12(4): 760-777. https://doi.org/10.26599/JAC.2023.9220718

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Received: 21 October 2022
Revised: 05 January 2022
Accepted: 08 January 2023
Published: 15 March 2023
© The Author(s) 2023.

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