Microwave dielectric properties of low firing temperature stable scheelite structured (Ca,Bi)(Mo,V)O4 solid solution ceramics for LTCC applications

Guo, Huanhuan; Zhou, Di; Pang, Li‐Xia; Qi, Zeming

doi:10.1016/j.jeurceramsoc.2019.02.010

Cited by 171 publications

(78 citation statements)

References 33 publications

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“…So, the optimum sintering temperature of (Bi 1 − x Ce x )VO 4 (0.7 ≤ x ≤ 0.95) ceramics increased from 890°C to 950°C as x increased. This result indicates that the sintering temperatures of CeVO 4 ceramic can be lowered by the formation of solid solution and similar phenomena also exist in many other solid solution systems, such as (1 − x )BiVO 4 ‐ x LaNbO 4 , (1 − x )BiVO 4 ‐ x La 2/3 MoO 4 , (Ca 1 − x Bi x )(Mo 1 − x V x )O 4 , and (1 − x )BiVO 4 ‐ x (Ag 0.5 Bi 0.5 )MoO 4 etc …”

Section: Resultssupporting

confidence: 58%

Microwave dielectric properties of temperature‐stable zircon‐type (Bi, Ce)VO₄ solid solution ceramics

et al. 2019

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In the (Bi1 − xCex)VO4 (0 ≤ x ≤ 1) system, we found that the (Bi1 − xCex)VO4 (0 ≤ x ≤ 0.1) belongs to the monoclinic scheelite phase and the (Bi1 − xCex)VO4 (0.7 ≤ x ≤ 1) belongs to the tetragonal zircon phase, while the (Bi1 − xCex)VO4 (0.1 < x < 0.7) belongs to the mixed phases of both monoclinic scheelite and tetragonal zircon structure. Interestingly, two components with near‐zero temperature coefficient of resonant frequency (TCF) appeared in this system. In our previous work, a near‐zero TCF of ~+15 ppm/°C was obtained in a (Bi0.75Ce0.25)VO4 ceramic with a permittivity (εr) of ~47.9 and a Qf (Q = quality factor = 1/dielectric loss; f = resonant frequency) value of ~18 000 GHz (at 7.6 GHz). Furthermore, in the present work, another temperature‐stable microwave dielectric ceramic was obtained in (Bi0.05Ce0.95)VO4 composition sintered at 950°C and exhibits good microwave dielectric properties with a εr of ~11.9, a Qf of ~22 360 GHz (at 10.6 GHz), and a near‐zero TCF of ~+6.6 ppm/°C. The results indicate that this system might be an interesting candidate for microwave device applications.

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Section: Resultssupporting

confidence: 58%

Microwave dielectric properties of temperature‐stable zircon‐type (Bi, Ce)VO₄ solid solution ceramics

et al. 2019

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“…The theoretical quality factor values of Mg 2 Ge 0.98 O 4 in the microwave frequency region (ω « ω pj ) are calculated by the following equation:

ε^{'} = ε_{\infty} + \sum_{j = 1}^{n} \frac{ω_{pj}^{2}}{ω_{oj}^{2}} = ε_{\infty} + \sum_{j = 1}^{n} normalΔ ε_{j}

\tan δ (ω) = \frac{ε^{″}}{ε^{'}} = ω \sum_{j = 1}^{n} \frac{Δ ε_{normalj} γ_{normalj}}{ω_{oj}^{2} (ε_{\infty} + \sum_{j = 1}^{n} normalΔ ε_{j})}

…”

Section: Resultsmentioning

confidence: 99%

Structure, microwave dielectric performance, and infrared reflectivity spectrum of olivine‐type Mg₂Ge_0.98O₄ ceramic

et al. 2019

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An ultra‐low dielectric loss ceramics Mg2Ge0.98O4 with olivine structure was fabricated by conventional solid‐state route. The phase composition, crystal structure, and microwave dielectric properties were investigated. The phase of Mg2Ge0.98O4 is formed to the orthorhombic forsterite structure with a space group Pmnb (62). The dense microstructure and excellent microwave dielectric properties of Mg2Ge0.98O4 ceramic were obtained at 1360°C for 4 hours, with relative density ~96.4%, εr ~ 7.3, Q × f = 112 400 GHz, and τf ~ −64.6 ppm/°C. The conductive mechanism of Mg2Ge0.98O4 in the low frequency (<1 MHz) was studied by the dielectric spectroscopy and the result with Edc = 0.93 eV demonstrates that the defect was contributed to the double ionized oxygen vacancies. The intrinsic dielectric properties of Mg2Ge0.98O4 in the microwave region were obtained by infrared reflectivity spectra with εr ~ 7.13, Q × f = 120 400 GHz. And, acceptable τf (~+2.6 ppm/°C) of 0.92Mg2Ge0.98O4–0.08CaTiO3 composite ceramic was obtained by adding the CaTiO3.

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“…The high sintering temperature (>1000°C) and relatively large positive τ f value (~ +63.5 ppm/ ° C), however, still limit its potential utilization in low temperature cofired ceramics (LTCC) application in which the ceramic layers should be cofired with the inner electrodes (generally silver) . Thus, reduction in sintering temperature to below the melting temperature of silver (961°C) and tailoring τ f to near‐zero is necessary for M 3 (VO 4 ) 2 …”

Section: Introductionmentioning

confidence: 99%

Tunable microwave dielectric properties in SrO‐V₂O₅ system through compositional modulation

Yin

Deng

et al. 2019

J Am Ceram Soc

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Adjustment on resonance frequency stability against the sintering temperature of Sr3V2O8 was realized by adjusting the Sr:V mole ratio. Effects of Sr:V ratio on sintering behavior and dielectric properties of Sr3V2O8 were studied. The sintering temperature was sucessfully reduced to 950°C from 1150°C. With increasing vanadium content, both relative permittivity and quality factor decreased, while the temperature coefficient of resonance frequency shifted from positive to negative values. Especially, a near‐zero τf of −1.1 ppm/°C along with a low permittivity (εr) of 9.8 and a quality factor Q × f of 24 120 GHz was successfully achieved in Sr3‐yV2O8‐y ceramic (y = 0.6, sintered at 950°C). The wide compositional and processing adjustment window, favorable dielectric performances, and good chemical compatibility with silver render Sr3‐yV2O8‐y ceramics potential candidates in multilayer electronic devices.

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Microwave dielectric properties of low firing temperature stable scheelite structured (Ca,Bi)(Mo,V)O4 solid solution ceramics for LTCC applications

Cited by 171 publications

References 33 publications

Microwave dielectric properties of temperature‐stable zircon‐type (Bi, Ce)VO₄ solid solution ceramics

Microwave dielectric properties of temperature‐stable zircon‐type (Bi, Ce)VO₄ solid solution ceramics

Structure, microwave dielectric performance, and infrared reflectivity spectrum of olivine‐type Mg₂Ge_0.98O₄ ceramic

Tunable microwave dielectric properties in SrO‐V₂O₅ system through compositional modulation

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Microwave dielectric properties of low firing temperature stable scheelite structured (Ca,Bi)(Mo,V)O4 solid solution ceramics for LTCC applications

Cited by 171 publications

References 33 publications

Microwave dielectric properties of temperature‐stable zircon‐type (Bi, Ce)VO4 solid solution ceramics

Microwave dielectric properties of temperature‐stable zircon‐type (Bi, Ce)VO4 solid solution ceramics

Structure, microwave dielectric performance, and infrared reflectivity spectrum of olivine‐type Mg2Ge0.98O4 ceramic

Tunable microwave dielectric properties in SrO‐V2O5 system through compositional modulation

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Microwave dielectric properties of temperature‐stable zircon‐type (Bi, Ce)VO₄ solid solution ceramics

Microwave dielectric properties of temperature‐stable zircon‐type (Bi, Ce)VO₄ solid solution ceramics

Structure, microwave dielectric performance, and infrared reflectivity spectrum of olivine‐type Mg₂Ge_0.98O₄ ceramic

Tunable microwave dielectric properties in SrO‐V₂O₅ system through compositional modulation