Low temperature sintering and microwave dielectric properties of 0.2Ca0.8Sr0.2TiO3–0.8Li0.5Sm0.5TiO3 ceramics with BaCu (B2O5) additive and TiO2 dopant

Gu, Fei-fei; Chen, Guohua; Yuan, Changlai; Zhou, Changrong; Yang, Tao; Yang, Yun

doi:10.1016/j.materresbull.2014.10.025

Cited by 22 publications

(3 citation statements)

References 26 publications

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“…There has been interest in LnNbO 4 , in which Ln represents rare earth elements, due to its excellent dielectric properties, including high permittivity ( ε r ) up to 40 and low dielectric loss (tan δ ) of around 0.3 ‰ at 1 GHz [24]. Consequently, LnNbO 4 ceramics are suitable for resonant circuits and high‐frequency applications.…”

Section: Resultsmentioning

confidence: 99%

Investigating the effects of uniaxial pressure on the preparation of MgTiO₃–CaTiO₃ ceramic capacitors for MRI systems

Jebri,

Taleb Ali,

Bord Majek

2023

The Journal of Engineering

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Today's healthcare system relies on magnetic resonance imaging (MRI) for early diagnosis and treatment planning. For open MRI systems to achieve resolutions of about a hundred microns, a high voltage is required, as well as a specialized power supply. Negative–positive–zero (NP0) ceramic is selected for the fabrication of adjustable capacitors. Specifically, it stands for which is a classification based on the temperature coefficient of capacitance (TCC) of the ceramic material used in the capacitor. NP0 capacitors have a TCC of 0 ±30 ppm/°C, which means that their capacitance value does not change significantly with temperature and frequency. They are known for their stability and low losses, making them ideal for applications that require high accuracy and reliability, such as timing circuits for radio frequency (RF) applications. Here, MgTiO3–CaTiO3 ceramic is used to make an adjustable capacitor with desired properties for MRI systems. To enhance the dielectric properties of MgTiO3 ceramics, CaTiO3 was added in varying concentrations. After pressing and sintering, the resulting samples were tested using a vector network analyzer in the frequency range of 10–130 MHz. The adjustable capacitor fabricated using high co‐fired NP0 ceramic may have been used for MRI applications such as tuning circuits and matching networks, where precise capacitance values and low loss are critical. MRI systems with resonance frequencies of 128 MHz require trimmers with ceramic cores (VBreakdown = 3 kV @ 128 MHz, Cmin = 3 pF, CMax = 30 pF, and Cvariation step = 1.5 pF).

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Section: Resultsmentioning

confidence: 99%

Investigating the effects of uniaxial pressure on the preparation of MgTiO₃–CaTiO₃ ceramic capacitors for MRI systems

Jebri,

Taleb Ali,

Bord Majek

2023

The Journal of Engineering

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“…Li et al [7] reported that the Ca 1-x (Li 1/2 Sm 1/2 ) x TiO 3 ceramics have a good performance with microwave dielectric properties of ε r = 105.8, Q×f = 3170 GHz and τ f = 0 ppm/ºC when x = 0.75. Gu et al [8] found that the 0.2Ca 0.8 Sr 0.2 TiO 3 -0.8(Li 0.5 Sm 0.5 )TiO 3 solid solution ceramics exhibit good microwave dielectric properties of ε r = 113, Q×f = 4400 GHz and τ f = 8.4 ppm/ºC. Unfortunately, the Q×f value of these systems is still relatively low.…”

Section: Introductionmentioning

confidence: 99%

Raman/Infrared Spectra and Microwave Dielectric Properties of 0.22CaTiO3-0.78(Li0.5Sm0.5)TiO3 Ceramics with MgO Additive

Ning

Jiang

Zhang

2018

MSF

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0.22CaTiO3-0.78(Li0.5Sm0.5)TiO3+ x wt% MgO (0.25 ≤ x ≤ 2.0) ceramics with pure perovskite structure were prepared by a conventional two-step solid-state reaction process. The effect of different content of MgO additive on the microwave dielectric properties of the 0.22CaTiO3-0.78(Li0.5Sm0.5)TiO3ceramics was investigated in detail. The results of microwave dielectric properties showed that the permittivity (εr) and temperature coefficient of resonant frequency (τf) decreased gradually, while quality factor (Q×f) values increased when the x value increased. Raman spectra and infrared reflectivity spectra were used to study the relationship between vibrational modes and microwave dielectric properties. The harmonic oscillator model was used to fit infrared reflectivity spectra, and the obtained complex dielectric response was extrapolated down into the microwave region. It was found that the complex dielectric spectra were in good agreement with the measured microwave permittivity and dielectric loss. The 0.22CaTiO3-0.78(Li0.5Sm0.5)TiO3+ 0.50 wt% MgO ceramic sintered at 1240°C for 4 h exhibited good microwave dielectric properties with εr= 102.6, Q×f = 5084 GHz (at 3.8 GHz), and τf= -16.3 ppm/°C.

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“…1 Commonly, it is tough to obtain microwave dielectric materials with high dielectric constant and high quality factor simultaneously, because these parameters are generally negatively correlated. Homologous compounds A n B nÀ1 O 3n (n = 4 to 8) with hexagonal perovskite-like layer structure have received much attention in recent years owing to their excellent microwave dielectric properties, especially for n = 5.…”

Section: Introductionmentioning

confidence: 99%

Microwave Dielectric Properties of Ba0.2Sr0.8La4Ti4O15 Ceramic with La2O3-B2O3-TiO2 Doping

Tang

et al. 2015

Journal of Elec Materi

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15 (BSLT) ceramic were investigated in this study. X-ray diffraction results showed that a small amount of SrLaBO 4 secondary phase was formed in the LBT-doped BSLT ceramics. Scanning electron microscopy indicated that addition of LBT glass restrained grain growth of the main phase. Samples doped with LBT showed strong promotion of both e r and Q 9 f values. Typically, the LBT (La 2 O 3 :B 2 O 3 :TiO 2 = 1:0.5:0.5)-doped Ba 0.2 Sr 0.8 La 4 Ti 4 O 15 ceramic sintered at 1550°C for 3 h in air exhibited good microwave dielectric properties of e r = 50.7, Q 9 f = 72,700 GHz, and s f = À7.3 ppm/°C.

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Low temperature sintering and microwave dielectric properties of 0.2Ca0.8Sr0.2TiO3–0.8Li0.5Sm0.5TiO3 ceramics with BaCu (B2O5) additive and TiO2 dopant

Cited by 22 publications

References 26 publications

Investigating the effects of uniaxial pressure on the preparation of MgTiO₃–CaTiO₃ ceramic capacitors for MRI systems

Investigating the effects of uniaxial pressure on the preparation of MgTiO₃–CaTiO₃ ceramic capacitors for MRI systems

Raman/Infrared Spectra and Microwave Dielectric Properties of 0.22CaTiO<sub>3</sub>-0.78(Li<sub>0.5</sub>Sm<sub>0.5</sub>)TiO<sub>3</sub> Ceramics with MgO Additive

Microwave Dielectric Properties of Ba0.2Sr0.8La4Ti4O15 Ceramic with La2O3-B2O3-TiO2 Doping

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Low temperature sintering and microwave dielectric properties of 0.2Ca0.8Sr0.2TiO3–0.8Li0.5Sm0.5TiO3 ceramics with BaCu (B2O5) additive and TiO2 dopant

Cited by 22 publications

References 26 publications

Investigating the effects of uniaxial pressure on the preparation of MgTiO3–CaTiO3 ceramic capacitors for MRI systems

Investigating the effects of uniaxial pressure on the preparation of MgTiO3–CaTiO3 ceramic capacitors for MRI systems

Raman/Infrared Spectra and Microwave Dielectric Properties of 0.22CaTiO<sub>3</sub>-0.78(Li<sub>0.5</sub>Sm<sub>0.5</sub>)TiO<sub>3</sub> Ceramics with MgO Additive

Microwave Dielectric Properties of Ba0.2Sr0.8La4Ti4O15 Ceramic with La2O3-B2O3-TiO2 Doping

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Investigating the effects of uniaxial pressure on the preparation of MgTiO₃–CaTiO₃ ceramic capacitors for MRI systems

Investigating the effects of uniaxial pressure on the preparation of MgTiO₃–CaTiO₃ ceramic capacitors for MRI systems