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 Li; Zexing Wang; Yunfeng Guo; Songlin Ran

doi:10.26599/JAC.2023.9220718

Journal of Advanced Ceramics 2023, 12(4): 760-777 https://doi.org/10.26599/JAC.2023.9220718

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Open Access | Issue | Published: 15 March 2023

Influences of substituting of (Ni_1/3Nb_2/3)⁴⁺ for Ti⁴⁺ on the phase compositions, microstructures, and dielectric properties of Li₂Zn[Ti_1−x(Ni_1/3Nb_2/3)_x]₃O₈ (0 ≤ x ≤ 0.3) microwave ceramics

Show Author's Information Hide Author's Information Jiamao Li^{^a^,^b}(

), Zexing Wang^{^a}, Yunfeng Guo^{^a}, Songlin Ran^{^a}

aSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243032, China

bKey Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, China

Keywords:

microstructure, microwave dielectric properties, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Li₂ZnTi₃O₈ ceramics

Cite this article:

Li J, Wang Z, Guo Y, et al. Influences of substituting of (Ni_1/3Nb_2/3)⁴⁺ for Ti⁴⁺ on the phase compositions, microstructures, and dielectric properties of Li₂Zn[Ti_1−x(Ni_1/3Nb_2/3)_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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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[Ti_1−x(Ni_1/3Nb_2/3)_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 (Ni_1/3Nb_2/3)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 A_1g 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 (ε_r) was closely related to the molar volume ionic polarizability ( $α_{D}^{T}$ ), and the temperature coefficient of the resonant frequency (τ_f) was related to the bond valence (V_i) 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: ε_r = 22.13, quality factor (Q×f) = 97,350 GHz, and τ_f = −18.60 ppm/℃, which might be a promising candidate for wireless communication applications in highly selective electronics.

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Influences of substituting of (Ni_1/3Nb_2/3)⁴⁺ for Ti⁴⁺ on the phase compositions, microstructures, and dielectric properties of Li₂Zn[Ti_1−x(Ni_1/3Nb_2/3)_x]₃O₈ (0 ≤ x ≤ 0.3) microwave ceramics

Show Author's information Hide Author's Information Jiamao Li^{^a^,^b}(

), Zexing Wang^{^a}, Yunfeng Guo^{^a}, Songlin Ran^{^a}

aSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243032, China

bKey Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, China

Abstract

Keywords: microstructure, microwave dielectric properties, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Li₂ZnTi₃O₈ ceramics

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Publication history

Received: 21 October 2022

Revised: 05 January 2022

Accepted: 08 January 2023

Published: 15 March 2023

Issue date: April 2023

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Acknowledgements

The authors gratefully acknowledged the Natural Science Foundation of Anhui Provincial Education Department (KJ2019A0054) and the Anhui Provincial Natural Science Foundation (1608085ME92).

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