Microwave dielectric properties of a low firing and temperature stable lithium magnesium tungstate (Li4MgWO6) ceramic with a rock-salt variant structure

Zhang, Xing; Fang, Zixuan; Jiang, Yinghao; Wang, Mingxia; Gee, Stephen; Zhou, Lei; Yang, Hongyu; Si, Feng; Zhao, Peng; Xiong, Zhe; Zhang, Shuren; Tang, Bin

doi:10.1016/j.jeurceramsoc.2021.09.010

Cited by 23 publications

(5 citation statements)

References 45 publications

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“…Inset graphs complement the visual data, offering insights into grain distribution and average grain size. In the case of the sample sintered at 1415°C, the grains exhibit a fine structure, interspersed with numerous minute pores, indicating insufficient sintering 24 . Elevating the sintering temperature to 1440°C results in a modest reduction in the number of pores within the sample.…”

Section: Resultsmentioning

confidence: 99%

“…In the case of the sample sintered at 1415 • C, the grains exhibit a fine structure, interspersed with numerous minute pores, indicating insufficient sintering. 24 Elevating the sintering temperature to 1440 • C results in a modest reduction in the number of pores within the sample. Moreover, approximately 60% of the grains increase in size from around 1 µm to the range of 1-2 µm, culminating in an average grain size of 1.42 µm.…”

Section: Resultsmentioning

confidence: 99%

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Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY₉Si₆O₂₆ ceramic

Li,

Liang,

Zhang

et al. 2024

J Am Ceram Soc.

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This study investigates NaY9Si6O26 ceramics prepared through the solid‐phase method, focusing on their microwave dielectric properties and crystallographic characteristics. X‐ray diffraction analysis reveals a hexagonal crystal structure for NaY9Si6O26 ceramics within the P63/m (176) space group. Rietveld refinement analysis precisely determines the lattice constants as a = b = 9.3423 Å, c = 6.7524 Å, and a unit cell volume of V = 510.3877 Å3. Additionally, Raman spectroscopy unveils a noteworthy correlation between the quality factor and the full width at half maximum of the A1g(O) mode at 878 cm−1. The structural attributes, including lattice fringes and diffraction patterns of hexagonal NaY9Si6O26 ceramics, are elucidated through transmission electron microscopy. Of significance are the microwave dielectric properties of NaY9Si6O26 ceramics sintered at 1465°C, revealing a relative permittivity (εr) of 10.42, an impressive Q × f product of 33 766 GHz (at f = 11.14 GHz), and a temperature coefficient of resonant frequency (τf) of −28.7 ppm/°C. This comprehensive investigation contributes to the understanding of both the structural and microwave dielectric characteristics of NaY9Si6O26 ceramics, with potential applications in advanced electronic devices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY₉Si₆O₂₆ ceramic

Li,

Liang,

Zhang

et al. 2024

J Am Ceram Soc.

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“…Considering the relative density of ceramics is larger than 95% and there is no second phase, the packing fraction can be calculated according to Eq. ( 6) [36,37]:…”

Section: Quality Factormentioning

confidence: 99%

A novel Na _{1−
x}K _xTaO ₃ perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient

Tang,

Yang,

et al. 2023

Journal of Advanced Ceramics

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A novel Na 1−x K x TaO 3 (x = 0, 0.025, 0.05, 0.075, 0.1, and 0.15) ceramic with high permittivity and high positive temperature coefficient was synthesized via the conventional solid-state method. All samples were determined to be pure phase orthorhombic NaTaO 3 structure of space group Pmcn, and larger grain and lower porosity were observed after adding an appropriate amount of K + ions. The Q × f value is majored by the packing fraction and grain size, while the value of τ f is influenced by Ta-O bond valence. The Na 0.95 K 0.05 TaO 3 ceramic possesses excellent dielectric properties of ε r = 164.29, Q × f = 9091 GHz (f = 3.15 GHz), tanδ = 3.46×10 -4 , τ f = +809.52 ppm/℃, sintered at 1550 ℃. Compared with NaTaO 3 ceramics, the Na 1−x K x TaO 3 ceramics prepared in this study demonstrate higher dielectric constants and higher positive temperature coefficients, which are promising for device miniaturization and τ f compensators.

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“…When the content of Li 2 TiO 3 was increased to 20%, the solid solution ceramics obtained excellent microwave dielectric properties: ε r = 16.1, Q · f = 128,600 GHz, and τ f = −30.4 ppm/°C. The team also prepared Li 4 MgWO 6 MWDC with good temperature stability based on the Li 2 O–WO 3 –MgO ternary phase diagram. 15 The ceramics were sintered at 950°C, and they had microwave dielectric properties of ε r = 15.06, Q · f = 28,300 GHz, and τ f = 0.9 ppm/°C.…”

Section: Introductionmentioning

confidence: 99%

Novel microwave dielectric ceramics based on CaO–MoO₃–La₂O₃ pseudo‐ternary phase diagram and the design of patch antenna

Bao,

Du,

et al. 2023

J Am Ceram Soc.

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In this study, two novel microwave dielectric ceramics were designed and synthesized using the solid‐state reaction method based on the CaO–MoO3–La2O3 pseudo‐ternary phase diagram. The X‐ray diffraction (XRD) patterns and Rietveld refinement results indicate that pure phase microwave dielectric ceramics (CaLa2(MoO4)4 and Ca3MoO6) can be produced with CaO, MoO3, La2O3 ratios of 1, 1, 4, and 3, 1, 0, respectively. CaLa2(MoO4)4 shows the potential value for application in Low Temperature Co‐fired Ceramic technology. In addition, the Phillips–van Vechten–Levine theory, infrared reflectance spectrum, and THz time‐domain spectrum are used further to study the structure‐property relationship of the two ceramics. Finally, a 5G patch antenna used in Sub‐6 GHz communication technology was successfully designed and manufactured. The study of the relationship between chemical bonds and dielectric properties of the two ceramics, along with the development of the patch antenna, establishes a foundation for scientific research and practical applications in related ceramic systems.

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Microwave dielectric properties of a low firing and temperature stable lithium magnesium tungstate (Li4MgWO6) ceramic with a rock-salt variant structure

Cited by 23 publications

References 45 publications

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY₉Si₆O₂₆ ceramic

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY₉Si₆O₂₆ ceramic

A novel Na _{1−
x}K _xTaO ₃ perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient

Novel microwave dielectric ceramics based on CaO–MoO₃–La₂O₃ pseudo‐ternary phase diagram and the design of patch antenna

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Microwave dielectric properties of a low firing and temperature stable lithium magnesium tungstate (Li4MgWO6) ceramic with a rock-salt variant structure

Cited by 23 publications

References 45 publications

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY9Si6O26 ceramic

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY9Si6O26 ceramic

A novel Na 1− x K x TaO 3 perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient

Novel microwave dielectric ceramics based on CaO–MoO3–La2O3 pseudo‐ternary phase diagram and the design of patch antenna

Contact Info

Product

Resources

About

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY₉Si₆O₂₆ ceramic

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY₉Si₆O₂₆ ceramic

A novel Na _{1−
x}K _xTaO ₃ perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient

Novel microwave dielectric ceramics based on CaO–MoO₃–La₂O₃ pseudo‐ternary phase diagram and the design of patch antenna