Li 4 WO 5 : A temperature stable low-firing microwave dielectric ceramic with rock salt structure

Li, Jie; Fang, Liang; Luo, Haiwen; Khaliq, Jibran; Tang, Ying; Li, Chunchun

doi:10.1016/j.jeurceramsoc.2015.09.033

Cited by 62 publications

(8 citation statements)

References 24 publications

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“…It is well known that the dielectric loss of microwave ceramics is determined by intrinsic losses, related to the crystal structure, and extrinsic losses, for example, density, impurity, grain size, pores, and secondary phase, etc . The value of bulk density of Li 3 Mg 2 (Nb (1− x ) Mo x )O 6+ x /2 ceramics sintered at 1200°C for 6 hours were close to the theoretical density.…”

Section: Resultssupporting

confidence: 59%

Crystal structure, densification, and microwave dielectric properties of Li₃Mg₂(Nb_(1−x)Mo_x)O_6+x/2 (0 ≤ x ≤ 0.08) ceramics

et al. 2019

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show abstract

Section: Resultssupporting

confidence: 59%

Crystal structure, densification, and microwave dielectric properties of Li₃Mg₂(Nb_(1−x)Mo_x)O_6+x/2 (0 ≤ x ≤ 0.08) ceramics

et al. 2019

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“…The slightly higher theoretical permittivity of Ba 2 NdV 3 O 11 than its Sm counterpart could be due to the larger ionic polarizability of Nd 3+ (5.01 Å) than Sm 3+ (4.74 Å). Additionally, the relative error between the porosity corrected ε r and the theoretical density is about 7.2% for the Ba 2 NdV 3 O 11 ceramic and 8.3% for Ba 2 SmV 3 O 11 ceramic, which indicates that ionic polarization plays a prominent role in the dielectric polarizability in the microwave frequency region …”

Section: Resultsmentioning

confidence: 93%

“…Additionally, the relative error between the porosity corrected e r and the theoretical density is about 7.2% for the Ba 2 NdV 3 O 11 ceramic and 8.3% for Ba 2 SmV 3 O 11 ceramic, which indicates that ionic polarization plays a prominent role in the dielectric polarizability in the microwave frequency region. 11,28 Figure 4 shows | 775 different temperatures for 4 hours. Similar to the density and relative permittivity, the quality factors also exhibited strong dependency on the sintering temperature.…”

Section: Microwave Dielectric Propertiesmentioning

confidence: 99%

Low‐firing and temperature stable microwave dielectric ceramics: Ba₂LnV₃O₁₁ (Ln = Nd, Sm)

Xiang

et al. 2017

J Am Ceram Soc

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Low‐firing and temperature stable microwave dielectric ceramics of Ba2LnV3O11 (Ln = Nd, Sm) were prepared by solid‐state reaction. X‐ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate the phase purity, crystal structure, sintering behavior, and microstructure. The XRD patterns indicated that Ba2LnV3O11 (Ln = Nd, Sm) ceramics belong to monoclinic crystal system with P21/c space group in the whole sintering temperature range (800°C ‐900°C). Both ceramics could be well densified at 880°C for 4 hours with relative densities higher than 96%. The Ba2LnV3O11 (Ln = Nd, Sm) samples sintered at 880°C for 4 hours exhibited excellent microwave dielectric properties: εr = 12.05, Q × f = 23 010 GHz, τf = −7.7 ppm/°C, and εr = 12.19, Q × f = 27 120 GHz, τf = −16.2 ppm/°C, respectively. Besides, Ba2LnV3O11 (Ln = Nd, Sm) ceramics could be well co‐fired with the silver electrode at 880°C.

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“…Fluoride is a type of microwave dielectric ceramic as well. Many microwave dielectric ceramics with the crystal structure of rock‐salt or fluorite have been reported, including Li 4 WO 5 and CeO 2 –CaTiO 3 31,32 . Fluorides with the crystal structures of rock‐salt and fluorite are expected to have good microwave dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

Low‐temperature‐sintered MgO‐based microwave dielectric ceramics with ultralow loss and high thermal conductivity

Zhao

Chen

et al. 2022

J Am Ceram Soc.

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With the development of 5G/6G communication, the requirements of portable devices for miniaturization and multifunction make low‐temperature co‐fired ceramic (LTCC) more and more important. In the area of high‐frequency high‐density passive integration, microwave dielectric ceramics with a low dielectric loss and high thermal conductivity are urgently needed to ensure the effective signals transmission and system reliability. However, most microwave dielectric ceramics with a low dielectric loss were not applicable for the LTCC technology due to the high sintering temperature. In this work, a series of MgO‐based ceramics [(100 − x) wt.% MgO–x wt.% (0.2SrF2–0.8LiF) (x = 5,7,10)] were prepared by solid‐state reaction method. The addition of sintering aid 0.2SrF2–0.8LiF (S2L8) decreased the sintering temperature below 880°C without degrading the microwave dielectric properties of ceramics. Microwave dielectric properties of ceramics, including quality factor Q × f, relative permittivity εr, and temperature coefficient of resonant frequency τf, were investigated to find the optimum composition and sintering temperature. In general, MgO–7 wt.% S2L8 ceramic sintered at 860°C exhibits outstanding properties of Q × f = 180 233 GHz, εr = 9.11, τf = −40.33 ppm/°C, and a high thermal conductivity of 24.02 W/(m K). This series of ceramics are suitable to be co‐fired with Ag electrodes. With all those great properties, this series of MgO‐based ceramics are expected to be the candidates for LTCC applications in 5G/6G technology.

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Li 4 WO 5 : A temperature stable low-firing microwave dielectric ceramic with rock salt structure

Cited by 62 publications

References 24 publications

Crystal structure, densification, and microwave dielectric properties of Li₃Mg₂(Nb_(1−x)Mo_x)O_6+x/2 (0 ≤ x ≤ 0.08) ceramics

Crystal structure, densification, and microwave dielectric properties of Li₃Mg₂(Nb_(1−x)Mo_x)O_6+x/2 (0 ≤ x ≤ 0.08) ceramics

Low‐firing and temperature stable microwave dielectric ceramics: Ba₂LnV₃O₁₁ (Ln = Nd, Sm)

Low‐temperature‐sintered MgO‐based microwave dielectric ceramics with ultralow loss and high thermal conductivity

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Li 4 WO 5 : A temperature stable low-firing microwave dielectric ceramic with rock salt structure

Cited by 62 publications

References 24 publications

Crystal structure, densification, and microwave dielectric properties of Li3Mg2(Nb(1−x)Mox)O6+x/2 (0 ≤ x ≤ 0.08) ceramics

Crystal structure, densification, and microwave dielectric properties of Li3Mg2(Nb(1−x)Mox)O6+x/2 (0 ≤ x ≤ 0.08) ceramics

Low‐firing and temperature stable microwave dielectric ceramics: Ba2LnV3O11 (Ln = Nd, Sm)

Low‐temperature‐sintered MgO‐based microwave dielectric ceramics with ultralow loss and high thermal conductivity

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Crystal structure, densification, and microwave dielectric properties of Li₃Mg₂(Nb_(1−x)Mo_x)O_6+x/2 (0 ≤ x ≤ 0.08) ceramics

Crystal structure, densification, and microwave dielectric properties of Li₃Mg₂(Nb_(1−x)Mo_x)O_6+x/2 (0 ≤ x ≤ 0.08) ceramics

Low‐firing and temperature stable microwave dielectric ceramics: Ba₂LnV₃O₁₁ (Ln = Nd, Sm)