Controllable τ<sub>f</sub> value of barium silicate microwave dielectric ceramics with different Ba/Si ratios

Lei, Wen; Zou, Zheng‐Yu; Chen, Ze-Hao; Ullah, Burhan; Zeb, Aurang; Lan, Xue‐Kai; Lu, Wen‐Zhong; Fan, Guifen; Wang, Xiao-Chuan

doi:10.1111/jace.15205

Cited by 73 publications

(37 citation statements)

References 25 publications

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“…Figure shows the temperature dependence of relative permittivity ( ε r ) at 100 Hz, 1k Hz, 10 kHz, 100 kHz, and 1 MHz. The Debye relaxation peak at 0°C‐100°C is the dielectric relaxation behavior due to the absorption of moisture by the sample . Herein, the temperature dependence of relative permittivity at 1 MHz from 150°C to 300°C was used to calculate the τ ε as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…The Debye relaxation peak at 0°C-100°C is the dielectric relaxation behavior due to the absorption of moisture by the sample. 32 Herein, the temperature dependence of relative permittivity at 1 MHz from 150°C to 300°C was used to calculate the τ ε as shown in Figure 6. The calculated τ f value (−83 ppm/°C) from dielectric spectroscopy is lower than the measured τ f value (−64.6 ppm/°C) at the microwave regions, which indicates that other polarization mechanisms were contributed to the dielectric constant at 150°C-300°C.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

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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“…10,13 Moreover low-permittivity microwave dielectric ceramics with a positive temperature coefficient of resonant frequency (τ f ) based on the ε r -τ f relationship are rare. 15 In the CaO-SnO 2 -SiO 2 system, only CaSnSiO 5 and Ca 3 SnSi 2 O 9 ternary oxides exist. CaSnSiO 5 and Ca 3 SnSi 2 O 9 ceramics exhibit high Q × f values and low permittivity, 7,11 and only CaSnSiO 5 ceramic possess an abnormally large positive τ f values.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure, phase compositions, and microwave dielectric properties of malayaite‐type Ca₁₋_xSr_xSnSiO₅ ceramics

Jiang

Zou

et al. 2020

J Am Ceram Soc

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Low‐permittivity Ca1−xSrxSnSiO5 (0 ≤ x ≤ 0.45) microwave dielectric ceramics were prepared via traditional state‐reaction at 1400°C‐1450°C for 5 hours. Moreover the microwave dielectric properties of SnO2 ceramic were obtained for the first time. SnO2 ceramic was difficult to densify, and SnO2 ceramic (ρrel = 65.1%) that was sintered at 1525°C exhibited the optimal microwave dielectric properties of εr = 5.27, Q × f = 89 300 GHz (at 14.5 GHz), and τf = −26.7 ppm/°C. For Ca1−xSrxSnSiO5 (0 ≤ x ≤ 0.15) ceramics, Sr2+ could be dissolved in the Ca2+ site of Ca1−xSrxSnSiO5 to form a single phase, and the partial substitution of Ca2+ by Sr2+ could improve the microwave dielectric properties of CaSnSiO5 ceramic. Secondary phases (SnO2 and SrSiO3) appeared at 0.2 ≤ x ≤ 0.45 and could adjust the abnormally positive τf value of CaSnSiO5 ceramic. The highest Q × f value (60 100 GHz at 10.4 GHz) and optimal microwave dielectric properties (εr = 9.42, Q × f = 47 500 GHz at 12.4 GHz, and τf = −1.2 ppm/°C) of Ca1−xSrxSnSiO5 ceramics were obtained at x = 0.05 and 0.45, respectively.

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“…The dielectric resonator generally uses the frequency of a certain vibration mode of dielectric ceramic as its center frequency. Therefore, in order to eliminate the temperature drift of the resonant frequency characteristic of the resonator, it is necessary to make the TCF close to zero …”

Section: Introductionmentioning

confidence: 99%

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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Controllable τ_f value of barium silicate microwave dielectric ceramics with different Ba/Si ratios

Cited by 73 publications

References 25 publications

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

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

Crystal structure, phase compositions, and microwave dielectric properties of malayaite‐type Ca₁₋_xSr_xSnSiO₅ ceramics

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

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Controllable τf value of barium silicate microwave dielectric ceramics with different Ba/Si ratios

Cited by 73 publications

References 25 publications

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

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

Crystal structure, phase compositions, and microwave dielectric properties of malayaite‐type Ca1−xSrxSnSiO5 ceramics

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

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Controllable τ_f value of barium silicate microwave dielectric ceramics with different Ba/Si ratios

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

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

Crystal structure, phase compositions, and microwave dielectric properties of malayaite‐type Ca₁₋_xSr_xSnSiO₅ ceramics

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