Microwave dielectric properties of ultra-low temperature fired Li 3 BO 3 ceramics

Chang, Shawn; Pai, H.C.; Tseng, Ching‐Fang; Tsai, Chih-Kai

doi:10.1016/j.jallcom.2016.12.268

Cited by 27 publications

(3 citation statements)

References 14 publications

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“…However, network formers contained in the glass ceramics may absorb the microwave power deeply at microwave frequency band, deteriorating the microwave performance for the material. Chang et al reported that Li 3 BO 3 ceramic possesses the microwave dielectric properties of ε r ∼ 5, Advances in Materials Science and Engineering Q × f ∼ 37,200 GHz, and τ f ∼ 3.1 ppm/°C [19]. In this work, the addition of 12 wt.% of B 2 O 3 -LiF effectively reduced the sintering temperature but worsened the microwave performance of the ceramic.…”

Section: Resultsmentioning

confidence: 55%

Novel Low‐Permittivity (Mg_1−xCu_x)₂SiO₄ Microwave Dielectric Ceramics

Yuan

Wang

et al. 2018

Advances in Materials Science and Engineering

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The effects of B2O3–LiF addition on the phase composition, microstructures, and microwave dielectric properties of (Mg0.95Cu0.05)2SiO4 ceramics fabricated by a wet chemical method were studied in detail. The B2O3–LiF was selected as liquid-phase sintering aids to reduce the densification sintering temperature of (Mg0.95Cu0.05)2SiO4 ceramics. The B2O3 6%–Li2O 6%-modified (Mg0.95Cu0.05)2SiO4 ceramics sintered at 1200°C possess good performance of εr ∼ 4.37, Q×f ∼ 36,700 GHz and τf ∼ −42 ppm/°C.

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Section: Resultsmentioning

confidence: 55%

Novel Low‐Permittivity (Mg_1−xCu_x)₂SiO₄ Microwave Dielectric Ceramics

Yuan

Wang

et al. 2018

Advances in Materials Science and Engineering

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“…The list of the crystalline materials characterized by very low sintering temperatures accompanied by good intrinsic dielectric properties (including low dielectric loss) is really short. Besides the quite intensively studied molybdates [3][4][5][6][7][8][9][10][11][12][13][14], some borates [15][16][17][18], and tungstates [19][20][21] are also promising candidates.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Szwagierczak¹,

Synkiewicz-Musialska²,

Kulawik³

et al. 2023

Journal of Advanced Ceramics

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With the development of low dielectric permittivity materials having an ultra-low sintering temperature, testing their dielectric properties at terahertz frequencies suitable for 6G communication systems and implementation of the fabricated materials in ultra-low temperature cofired ceramics (ULTCC) were the main goals of the research. Lithium tungstate Li 2 WO 4 was synthesized by a solid-state reaction and used for the preparation of green tapes and test structures with cofired internal conductive layers, which are destined for substrates of microwave and submillimeter wave circuits. Sintering behavior, thermal effects, and mass changes of the green tapes during heating were studied using a hot-stage microscope, differential thermal analysis, and thermogravimetry. A single-phase composition was revealed for being undoped and doped with AlF 3 -CaB 4 O 7 ceramics. The impact of frequency, temperature, the addition of AlF 3 -CaB 4 O 7 and CuBi 2 O 4 dopants, and sintering temperature was the subject of in-depth characterization of dielectric properties in a terahertz region. A glass-free composition, ultra-low sintering temperature of 590-630 ℃, low roughness of the green tapes, dense microstructure, compatibility with Ag conductors, low and stable dielectric permittivity of 5.0-5.8 in a broad range of 0.2-2 THz, and low dielectric loss of 0.008-0.01 at 1 THz are the main advantages of the developed ULTCC substrates.

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“…5 Silicate raw materials are cheap and easy to obtain, so they have been widely studied. 13 In addition, phosphate [14][15][16][17][18][19] and borate [20][21][22][23] ceramics have also been studied because of their low permittivity. Most of the low-k microwave dielectric materials currently studied have a dielectric constant between 5 ∼ 10, 4,5,13 and only a few materials indicate a dielectric constant lower than 5.…”

Section: Introductionmentioning

confidence: 99%

Low‐k dielectric materials derived from ZSM‐5 zeolite

Shi,

Sun,

Zhou

et al. 2023

J Am Ceram Soc.

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Low‐k dielectric materials were prepared by sintering ZSM‐5 zeolite powder compacts at temperatures ranged 1200–1300°C, and the microwave dielectric characteristics were investigated together with the structure evolution during sintering. It was failed to obtain ZSM‐5 ceramics by high temperature sintering because the densification could never occur below the tolerable temperature and the ordered porous structure completely collapsed above the tolerable temperature. The structure changed from ZSM‐5 zeolite to SiO2‐Al2O3 glass at 1240°C, and finally to SiO2‐based cristobalite ceramics above 1275°C. A low dielectric constant (2.63‐2.78) combined with low dielectric loss (< 0.0005 at 18 GHz) and small temperature coefficient of resonant frequency (varied from ‐18.6 to ‐8.1 ppm/°C) was achieved in the present materials, and the value of dielectric loss was the lowest one achieved so far in the dielectric materials with a dielectric constant lower than 3. With the structure evolution from ZSM‐5 zeolite to SiO2‐Al2O3 glass and finally to SiO2‐based cristobalite ceramics, the dielectric constant increased from 2.27 to 2.78, while the Qf value indicated a complicated variation tendency, and the higher Qf values were achieved in the amorphous and crystalline states, while significant drop was determined in the partial amorphous state. It should be a great challenge to prepare dense zeolite ceramics without collapse of ordered porous structure, and then the ultra‐low dielectric constant materials with high Q could be expected.

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Microwave dielectric properties of ultra-low temperature fired Li 3 BO 3 ceramics

Cited by 27 publications

References 14 publications

Novel Low‐Permittivity (Mg_1−xCu_x)₂SiO₄ Microwave Dielectric Ceramics

Novel Low‐Permittivity (Mg_1−xCu_x)₂SiO₄ Microwave Dielectric Ceramics

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies

Low‐k dielectric materials derived from ZSM‐5 zeolite

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Microwave dielectric properties of ultra-low temperature fired Li 3 BO 3 ceramics

Cited by 27 publications

References 14 publications

Novel Low‐Permittivity (Mg1−xCux)2SiO4 Microwave Dielectric Ceramics

Novel Low‐Permittivity (Mg1−xCux)2SiO4 Microwave Dielectric Ceramics

Ultra-low temperature cofired ceramics based on Li2WO4as perspective substrate materials for terahertz frequencies

Low‐k dielectric materials derived from ZSM‐5 zeolite

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Product

Resources

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Novel Low‐Permittivity (Mg_1−xCu_x)₂SiO₄ Microwave Dielectric Ceramics

Novel Low‐Permittivity (Mg_1−xCu_x)₂SiO₄ Microwave Dielectric Ceramics

Ultra-low temperature cofired ceramics based on Li₂WO₄as perspective substrate materials for terahertz frequencies