Crystal structure, phase evolution and dielectric properties in the Li2ZnTi3O8-SrTiO3 system as temperature stable high-Q material

Ren, Haishen; Xie, Tianyi; Wu, Zhilun; He, Fei; Zhang, Yi; Jiang, Shaohu; Yao, Xiaogang; Lin, Huixing

doi:10.1016/j.jallcom.2019.05.084

Cited by 13 publications

(3 citation statements)

References 36 publications

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“…This implies that the sample with x = 0.2 has the highest Q×f value of 97350 GHz. On the other hand, it is generally accepted that in several Ti-based microwave ceramics [63][64][65][66],…”

Section: / 41mentioning

confidence: 99%

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

Li¹,

Wang²,

Guo³

et al. 2023

Journal of Advanced Ceramics

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Complex ions 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 complex ions substitution strategy, following the substitution rule of radius and valence to investigate the 2 / 41 relationships between phase composition (containing oxygen vacancies and Ti 3+ ions), microstructure, and microwave dielectric characteristics of LZTNNx ceramics. The samples maintained a single Li2ZnTi3O8 solid solution phase as x ≤ 0.2 whereas the x = 0.3 sample produced a secondary phase with LiNbO3 structure. The appropriate amount of (Ni1/3Nb2/3) 4+ substitution could slightly improve the densification of LZTNNx ceramics due to the formation of Li2ZnTi3O8 solid solution accompanied by a decrease in average grain size. The presence of a new A1g Raman active band at about 848 cm -1 indicated that the local symmetry changed, affecting the atomic interactions of LZTNNx ceramics. The variation in dielectric constant (εr) was closely related to molar volume ionic polarizability, and the temperature coefficient of resonant frequency (τf) was related to the bond valence of Ti. The increase in density, the absences of Ti 3+ ions and oxygen vacancies, and the reduction in damping behavior were responsible for decreased dielectric loss. The LZTNN0.2 ceramic sintered at 1120 o C exhibited favorable microwave dielectric properties: εr = 22.13, quality factor (Q×f) = 97350 GHz, and τf = −18.6 ppm/ o C, which might be a promising candidate for wireless communication applications in highly selective electronics.

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Section: / 41mentioning

confidence: 99%

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

Li¹,

Wang²,

Guo³

et al. 2023

Journal of Advanced Ceramics

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“…Mg, Co, and Zn substitution for Zn in Li 2 ZnTi 3 O 8 increased the quality factor because of the more compact microstructure [257][258][259]. Whereas, the secondary phases were recorded after the introduction of Sr 2+ or (Sr x Ca 1-x ) into Li 2 ZnTi 3 O 8 [260][261][262]. Phase evolution of (1-x)Li 2 ZnTi 3 O 8 -xTiO 2 system indicated that pure Li 2 ZnTi 3 O 8 with cubic structure was observed when x ≤ 0.2 (the lattice parameter is similar to MgFe 2 O 4 with space group of Fm3 ¯m ( 227)), solid solution was exited in the range of 0.2 ≤ x ≤ 0.4 with cubic structure (the lattice parameters is similar to Zn 2 Ti 3 O 8 with space group of P4332 (212)), and rutile TiO 2 phase appeared when x ≥ 0.6 [263].…”

Section: Rock-salt Structurementioning

confidence: 99%

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

et al. 2021

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The explosive process of 5G communication evokes the urgent demand of miniaturized and integrated dielectric ceramics filter. It is a pressing need to advance the development of dielectric ceramics utilization of emerging technology to design new materials and understand the polarization mechanism. This review provides the summary of the study of microwave dielectric ceramics (MWDCs) sintered higher than 1000 from 2010 up to now, °C with the purpose of taking a broad and historical view of these ceramics and illustrating research directions. To date, researchers endeavor to explain the structure-property relationship of ceramics with multitude of approaches and design a new formula or strategy to obtain excellent microwave dielectric properties. There are variety of factors that impact the permittivity, dielectric loss, and temperature stability of dielectric materials, covering intrinsic and extrinsic factors. Many of these factors are often intertwined, which can complicate new dielectric material discovery and the mechanism investigation. Because of the various ceramics systems, pseudo phase diagram was used to classify the dielectric materials based on the composition. In this review, the ceramics were firstly divided into ternary systems, and then brief description of the experimental probes and complementary theoretical methods that have been used to discern the intrinsic polarization mechanisms and the origin of intrinsic loss was mentioned. Finally, some perspectives on the future outlook for high-temperature MWDCs were offered based on the synthesis method, characterization techniques, and significant theory developments.

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“…The electroceramics emerged as an excellent option for integration and miniaturization of electronic circuits, making smaller and more efficient systems [1]. Due to the advances in telecommunications, it is required that the materials have appropriated dielectric constant (ε r ), low dielectric loss (tan δ), near-zero temperature coefficient of resonant frequency (τ f ), highquality factor (Q x f), temperature stable and versatile [2,3]. Electroceramics are widely used in the manufacturing of microwave electronic devices, dielectric substrates, resonators owing to their easy integration in chips [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Bi2O3-B2O3 as a Sintering aid in Microstructure and Dielectric Properties of Fe2Mo3O12 Electroceramic.

Araújo¹,

Silva²,

Pereira³

et al. 2020

Preprint

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Molybdates from A2Mo3O12 family have been widely investigated due to its low sintering temperature, low thermal expansion coefficient, and low dielectric loss. Fe2Mo3O12 (FMO) is an oxide from this family and widely used in the catalytic field. The aim of this work is to evaluate the influence of the Bi2O3-B2O3 as a sintering aid in the microstructure and dielectric properties of FMO. The diffraction results showed that the FMO with the monoclinic structure phase was obtained after the calcination process (650 °C). Mössbauer spectroscopy showed the formation of Fe2O3 after the sintering process at 800 °C. The scanning electron-microscopic demonstrates an increase of the grain as a function of sintering aid concentration. The samples were analyzed by using the impedance spectroscopy at radiofrequency with temperature variation. The Nyquist diagram obtained in this temperature range was fitted from an equivalent circuit with three R-CPE associations, corresponding to the morphology of the electroceramics. For dielectric properties in the microwave, all the samples showed values of εr lower than 10. Values of Q x f above 14132.35 GHz were achieved. The thermal stability was evaluated by the temperature coefficient of resonant frequency (τf). The lowest τf values of -6.55 ppm/°C and -4.35 ppm/°C (near-zero) were measured to FMO and FMO mixed with 7.5 wt% Bi2O3-B2O3, respectively. Based on these results, FMO can be used to low permittivity ceramic for low temperature co-fired ceramics (LTCC) applications, antenna substrate, and millimeter-wave range.

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Crystal structure, phase evolution and dielectric properties in the Li2ZnTi3O8-SrTiO3 system as temperature stable high-Q material

Cited by 13 publications

References 36 publications

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

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

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

Effect of Bi2O3-B2O3 as a Sintering aid in Microstructure and Dielectric Properties of Fe2Mo3O12 Electroceramic.

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Crystal structure, phase evolution and dielectric properties in the Li2ZnTi3O8-SrTiO3 system as temperature stable high-Q material

Cited by 13 publications

References 36 publications

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

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

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

Effect of Bi2O3-B2O3 as a Sintering aid in Microstructure and Dielectric Properties of Fe2Mo3O12 Electroceramic.

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Product

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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

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