Sintering behavior and microwave performance of CaSiO3 ceramics doped with BaCu(B2O5) for LTCC applications

Ouyang, Linhong; Wang, Wenqian; Fan, Haichuan; Weng, Zhangzhao; Wang, Wenwei; Han, Xue

doi:10.1016/j.ceramint.2019.06.130

Cited by 22 publications

(9 citation statements)

References 32 publications

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“…where i V  and (Q × f ) i are the volume fraction and Q × f of each phase, respectively (the Q × f values of CaSiO 3 and Li 2 SiO 3 were 25,398 GHz [34] and 9849 GHz [35], respectively), were in the same trend as the measured ones when combining Figs. 7(a) and 7(b).…”

Section: Resultssupporting

confidence: 60%

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Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Huang

et al. 2020

J Adv Ceram

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In this study, low-temperature fired CaMg 1-x Li 2x Si 2 O 6 microwave dielectric ceramics were prepared via the traditional solid-state reaction method. In this process, 0.4 wt% Li 2 CO 3-B 2 O 3-SiO 2-CaCO 3-Al 2 O 3 (LBSCA) glass was added as a sintering aid. The results showed that ceramics consisted of CaMgSi 2 O 6 as the main phase. The second phases were CaSiO 3 always existing and Li 2 SiO 3 occurring at substitution content x > 0.05. Li + substitution effectively lowered sintering temperature due to 0.4 wt% LBSCA and contributed to grain densification, and the most homogeneous morphology could be observed at x = 0.05. The effects of relative density, the second phase, and ionic polarizability on dielectric constant ( r) were investigated. The quality factor (Q × f) varied with packing fraction that concerned the second phase. Moreover, the temperature coefficient of the resonant frequency (τ f) was influenced by MgO 6 octahedral distortion and bond valence. Excellent dielectric properties of the CaMg 1-x Li 2x Si 2 O 6 ceramic was exhibited at x = 0.05 with  r = 7.44, Q × f = 41,017 GHz (f = 15.1638 GHz), and τ f = −59.3 ppm/℃ when sintered at 900 ℃. It had a good application prospect in the field of low-temperature co-fired ceramic (LTCC) substrate and devices.

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Section: Resultssupporting

confidence: 60%

“…where ε ri represents dielectric constant of each phase (ε r (CaSiO 3 ) = 6.69 [34], ε r (Li 2 SiO 3 ) = 7.7 [35]), it could be inferred that ε r was affected by more ionic polarizability and ρ than the second phase combined with the above analysis.…”

Section: Resultsmentioning

confidence: 95%

Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Huang

et al. 2020

J Adv Ceram

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“…Table 2 summarizes the microwave dielectric properties ( r , Q×f, and τ f ) of LiBGeO 4 sintered at various temperatures and compares the dielectric performances of some low-firing borates and germanates [13,20,24,32,46,47]. For LiBGeO 4 , both relative permittivity ( r ) and quality factor (Q×f) featured a strong dependence on sintering temperature with a rise-fall variation tendency;…”

Section: Figurementioning

confidence: 99%

“…Generally, the use of glass or addition of sintering aids are recognized as compelling strategies for reducing sintering temperature [10,11]. However, these methods usually cause deterioration of the dielectric properties (especially the quality factor) as the residual and aggregated glasses or sintering aids act as second phases which leads to additional interfaces [12,13]. Recently, ceramics with intrinsic low densification temperatures, e.g.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of LiBGeO4 using compositional design and its dielectric behaviors at RF and microwave frequencies

Xing

Yin

et al. 2020

Ceramics International

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Borates are promising candidates as dielectric substrate materials in low temperature cofired ceramics technology (LTCC) due to their relative low sintering temperatures and relative permittivities compared to their counterparts. However, synthesizing borates having single-phase is still challenging because of the volatility and hydrophilicity of boron resources. In this work, a compositional design was utilized to synthesize single-phase LiBGeO 4 ceramics over a broad temperature range from 600 to 840 o C. Radio-frequency dielectric behaviours featured a strong temperature dependence, especially at high temperatures (> 400 o C), which is related to the thermally activated polarizations. LiBGeO 4 ceramic sintered at 820 o C has optimum microwave dielectric properties with the relative permittivity ( r ) of 6.28, a quality factor (Q×f) of 21,620 GHz, and a temperature coefficient of resonance frequency (τ f ) of -88.7 ppm/ o C. LiBGeO 4 also showed chemical inertness when cofired with silver (Ag), provided an evidence for its utilization in LTCC technology.Overall, this work provides a strategy for facile synthesis of phase pure borates, via the proposed two-step process to obtain stable boron resources.

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“…Meanwhile, Mg ferrites have application potential in antenna substrate due to their physical and chemical stability, soft magnetic characteristics, which enable them be suitable for antenna design and fabricating 29,30,31,32 . The effect of temperature on magnetic and dielectric behaviors of various kinds of ferrites have been deeply investigated to achieve specific function 33,34,35,36 . An important conclusion is an increase in temperature can develop magnetic and dielectric behaviors of these ferrites.…”

Section: Introductionmentioning

confidence: 99%

Temperature tailored magneto-dielectric properties of Cd-substituting Mg-based ferrite ceramics for miniaturized VHF antennas

Gan

2023

Sixth International Conference on Intelligent Computing, Communication, and Devices (ICCD 2023)

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The microstructure formation and structural regulation of Mg-Cd ferrites (Cd0.15Mg0.85Fe2O4) with 5% Bi2O3 addition at different sintering temperatures (880, 900, 920, and 940 °C) werer invsetigated for application in VHF antennas. The changes including microstructure, phase composition, magnetic and dielectric properties were mainly characterized. It was found that increasing temperature resulted in superior microstructure with accrescent grain size and denser arrangement. XRD patterns revealed normal spinel phase and a secondary phase of Bi compound. Meanwhile, a reinforcement of the magnetization including increased saturation magnetization (from 37.8 to 46.6 emu/g) and dropped coercivity (from 98.2 to 65.9 Oe) were obtained through hysteresis loops. A slight increment of μ' and ' were measured over a broad frequency range in VHF bands. Therefore, excellent magneto-dielectric properties of the proposed ferrites were obtained. In addition, low magnetic losses (tan δμ ~10 -2) and dielectric losses (tan δμ ~10 -3) indicating low power loss in operation. It is foreseeable that these properties of the proposed ferrites would behave well in miniaturized VHF antennas.

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Sintering behavior and microwave performance of CaSiO3 ceramics doped with BaCu(B2O5) for LTCC applications

Cited by 22 publications

References 32 publications

Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Low-temperature sintering and microwave dielectric properties of CaMg1−xLi2xSi2O6 (x = 0−0.3) ceramics

Synthesis of LiBGeO4 using compositional design and its dielectric behaviors at RF and microwave frequencies

Temperature tailored magneto-dielectric properties of Cd-substituting Mg-based ferrite ceramics for miniaturized VHF antennas

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