Effects of LiF additive on crystal structures, lattice vibrational characteristics and dielectric properties of CaWO4 microwave dielectric ceramics for LTCC applications

An, Zhongfen; Lv, Jiqing; Wang, Xiangyu; Xu, Yue; Zhang, Lingcui; Shi, Feng; Guo, Hongyu; Zhou, Di; Liu, Bing; Song, Kaixin

doi:10.1016/j.ceramint.2022.06.259

Cited by 51 publications

(5 citation statements)

References 35 publications

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“…In this study, 20 wt.% Ag powder (10 µm) and LaPO 4 -3 wt.% LiF ceramic powder at 750 • C are mixed and co-fired at 750 • C for 2 h. Figure 11 shows the XRD results. The results show that no chemical reaction occurs after co-firing LaPO 4 -3 wt.% LiF ceramic and Ag, and the co-firing is a success, which provides a new idea for the future application of LTCC [29].…”

Section: Resultsmentioning

confidence: 85%

“…performance [29][30][31]. When the amount of LiF continues to increase, the sintering te ature does not change significantly.…”

Section: Resultsmentioning

confidence: 98%

“…It is worth noting that due to the melting point of LiF at 845 • C, a part of LiF melts to form a liquid phase during the ceramic sintering process. When x ≥ 4, grain boundaries begin to soften, and macroscopic defects such as pores between grains and cracks appear on the surface, which particularly impacts the apparent density and performance [29][30][31]. When the amount of LiF continues to increase, the sintering temperature does not change significantly.…”

Section: Resultsmentioning

confidence: 99%

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Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Wang

Zhang

et al. 2023

Crystals

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This paper reports on the successful preparation of LaPO4-x wt.% LiF (x = 0–5) ceramics using the traditional solid-state reaction method. The crystal structures, sintering behaviors, and dielectric response at microwave and terahertz frequencies were investigated. XRD results indicate that all the diffraction peaks were attributed to LaPO4, and no secondary phase was observed. Rietveld refinement was conducted to analyze the variation of the crystal structure of LaPO4-x wt.% LiF. SEM indicates that the addition of LiF significantly decreased the grain size while increasing the apparent density of the ceramics. When x = 3, the optimum microwave dielectric properties εr = 10.03, Q × f = 81,467 GHz, and τf = −43.79 ppm/°C were achieved in LaPO4-3 wt.% LiF ceramic at 750 °C. The infrared reflectance spectrum and terahertz time-domain spectroscopy were analyzed and compared with the dielectric properties measured at microwave frequency to investigate the inherent dielectric response. The findings indicate that the dielectric constant attributed to ionic displacement polarization and oxygen vacancy is an essential factor affecting dielectric loss. Moreover, it is worth noting that the LaPO4-3 wt.% LiF ceramic demonstrates excellent compatibility with silver powders, suggesting its immense potential as a dielectric material in LTCC applications.

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Section: Resultsmentioning

confidence: 85%

“…performance [29][30][31]. When the amount of LiF continues to increase, the sintering te ature does not change significantly.…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Wang

Zhang

et al. 2023

Crystals

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“…This is because as the sintering temperature increases, the low melting point sintering agent LiF (a melting point of 848 °C) melts to form a liquid phase, which promotes the rearrangement and recrystallization of the grains and makes the ceramic denser. 24,25 This phenomenon can explain why the properties of the ceramics improve with an increase in the sintering temperature.…”

Section: Resultsmentioning

confidence: 96%

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics

Deng,

Qu,

Gao

et al. 2023

J. Mater. Chem. C

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“…With the emergence of 5G communication, there is a growing demand for materials with improved performance parameters for manufacturing communication devices. MWDCs have drawn significant attention due to their indispensable role in microwave and mobile communication [2,3]. As critical materials for communication devices such as dielectric substrates, dielectric antennas, and filters, materials with relative permittivity below 20 are widely used in fabricating microwave substrates and high-frequency microwave components.…”

Section: Introductionmentioning

confidence: 99%

Machine learning enhanced prediction of permittivity of spinel microwave dielectric ceramics compared to traditional C-M calculation

Liu,

Su,

Huang

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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Microwave dielectric ceramic (MWDC) is crucial in advancing the development of 5G technology and the communication field. The prediction or calculation of its properties is of great significance for accelerating the design and development of MWDCs. Therefore, the prediction of permittivity of spinel MWDCs based on machine learning was investigated in this work. Firstly, we collected 280 single-phase spinel MWDC entries and constructed feature engineering, which includes feature generation and feature selection (five dominant features, including Mpo, Dar, Mmbe, Aose and Dgnve, were selected from 208 generated features). Next, seven commonly used algorithms were utilized during the training process of machine learning models. The eXtreme Gradient Boosting (XGBoost) model shows the best performance with R-squared (R2) of 0.9095, Mean Absolute Error (MAE) of 1.02 and Root Mean Square Error (RMSE) of 1.96. Furthermore, all the machine learning models show enhanced prediction (calculation accuracy) of the permittivity of spinel MWDCs compared to the traditional Clausius-Mossotti (C-M) equation, which can provide a guide for the design and development of spinel MWDCs applied for wireless communication.

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Effects of LiF additive on crystal structures, lattice vibrational characteristics and dielectric properties of CaWO4 microwave dielectric ceramics for LTCC applications

Cited by 51 publications

References 35 publications

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics

Machine learning enhanced prediction of permittivity of spinel microwave dielectric ceramics compared to traditional C-M calculation

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Effects of LiF additive on crystal structures, lattice vibrational characteristics and dielectric properties of CaWO4 microwave dielectric ceramics for LTCC applications

Cited by 51 publications

References 35 publications

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Enhanced flexural strength and microwave dielectric properties of Li2MgTi3O8-based low temperature co-fired ceramics

Machine learning enhanced prediction of permittivity of spinel microwave dielectric ceramics compared to traditional C-M calculation

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Enhanced flexural strength and microwave dielectric properties of Li₂MgTi₃O₈-based low temperature co-fired ceramics