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49 results on '"Du, Jialun"'

5. One Case of THOUGHT: Industry-University Converged Education Practice on Open Source

Author

Yu, Zhiyi, Li, Chao, Hu, Chaochen, Chen, Zhen, Yao, Yandong, Wu, Jiang, Wang, Hao, Du, Jialun, Guo, Min, Wang, Haoyu, Li, Weimin, Li, Xiu, Ma, Xiaodong, Zhangi, Yisong, Li, Shuangshou, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Hong, Wenxing, editor, and Weng, Yang, editor

Published
2023
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14. One Case of THOUGHT: Industry-University Converged Education Practice on Open Source

Author

Yu, Zhiyi, primary, Li, Chao, additional, Hu, Chaochen, additional, Chen, Zhen, additional, Yao, Yandong, additional, Wu, Jiang, additional, Wang, Hao, additional, Du, Jialun, additional, Guo, Min, additional, Wang, Haoyu, additional, Li, Weimin, additional, Li, Xiu, additional, Ma, Xiaodong, additional, Zhangi, Yisong, additional, and Li, Shuangshou, additional

Published
2023
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38. Effect of (Zn1/3Nb2/3)4+ co-substitution on the microwave dielectric properties of Ce2Zr3(MoO4)9 ceramics

Author

Du Jialun, Ma Xiaomeng, Kimura Hideo, Wu Haitao, Zhou Xu, Lu Yizhong, Tian Huanrong, Yue Zhenxing, and Liu Lintao

Subjects
Lattice energy, Materials science, Process Chemistry and Technology, Doping, Analytical chemistry, Dielectric, Microstructure, Grain size, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Polarizability, Phase (matter), visual_art, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Ceramic
Abstract

Ce2[Zr1-x(Zn1/3Nb2/3)x]3(MoO4)9 (CZ1-x(ZN)xM) (x = 0.02–0.08) compounds were successfully prepared to scientifically examine the effect of (Zn1/3Nb2/3)4+ doping on phase composition, microstructures, and properties. The XRD results showed that all compounds formed a pure phase with the space group of R-3c. SEM results indicated that all compounds were compact at 675 °C, and the lattice parameters and average grain size decreased with doping. Performance analysis illustrated that er was closely related to the polarizability, and Q∙f was affected by the lattice energy of the Mo–O bond. The τf was maintained at an excellent level. Far-infrared analysis indicated that the major dielectric contribution to CZ1-x(ZN)xM ceramics was related to the absorption of phonon oscillation. The optimum properties (er = 10.72, Q∙f = 59,381 GHz, τf = −11.48 ppm/°C) were obtained when x = 0.04.

Published
2022

39. Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO 4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications.

Author

Li, Hu, Wang, Dongfeng, Zhang, Kainan, Guo, Weijia, Xu, Xiaoyu, Zhang, Yanbin, Sun, Yan, Xu, Xingqi, Du, Jialun, Wu, Haitao, Duan, Guangbin, and Yue, Zhenxing

Subjects
DIELECTRIC properties, CERAMICS, TERAHERTZ time-domain spectroscopy, DIELECTRICS, DIELECTRIC materials, MICROWAVES, DIELECTRIC loss
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2023
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40. The effect of (Mg1/3Ta2/3)4+ on the structure, Raman vibration, Terahertz time domain spectroscopy and dielectric properties for the Li2TiO3 ceramic

Author

Liu, Lintao, primary, Guo, Weijia, additional, Li, Hu, additional, Liu, Ping, additional, Qin, Shitong, additional, Rong, Xinxin, additional, Liu, Tengteng, additional, Du, Jialun, additional, Zhang, Yuping, additional, Chen, Yueguang, additional, Wu, Haitao, additional, and Yue, Zhenxing, additional

Published
2022
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47. Composition-structure-property relationships in CeZr1·14Bi0.045A0.045Mo4·5O18(A = Nb, Ta and Sb) microwave dielectric ceramics revealed by Raman, far-infrared and terahertz spectra

Author

Pan, Hailong, Zhou, Xu, Wu, Haitao, Du, Jialun, Feng, Zhanbai, and Wübbenhorst, Michael

Abstract

Understanding composition-structure-property relationships is critical to developments and applications of novel microwave dielectric ceramics used in the field of wireless communications. Herein, a series of CeZr1·14Bi0.045A0.045Mo4·5O18(abbreviated as CZA, A = Nb, Ta and Sb) ceramics were prepared through a solid-state reaction method. Density and scanning electron microscope results revealed dense and homogeneous microstructures. X-ray diffraction analysis indicated the formation of solid solutions. Accordingly, the effects of extrinsic factors were negligible and thus composition-structure-property relationships were systematically investigated by the combination of the chemical bond theory, Raman spectroscopy, far-infrared (FIR) spectroscopy and terahertz time-domain spectroscopy (THz-TDS) from an intrinsic perspective. Interestingly, the measured dielectric constants (εr) and quality factors (Q × f) are quite close to the extrapolated values from FIR and THz-TDS, and these values show a similar trend with varying components. In addition, Mo–O bonds play an important role in the coefficient of thermal expansion (α) and bond energy (E), and the composition dependent temperature coefficient of the resonance frequency (τf) can be well explained by variations of mean αand Eof Mo–O bonds.Typically, excellent properties of Q × f = 116,485 GHz (at 9.58 GHz), εr = 9.91 and τf = −19.20 ppm °C−1were achieved for the CZSb ceramic sintered at 700 °C. Notably, Q × fvalues of CZSb and CZTa ceramics are 6.13 and 4.16 times larger than that of the matrix, respectively. Ultra-high Q × f, low sintering temperatures (600 − 700 °C) and low εrmake them potential candidates for low temperature co-fired ceramics (LTCC) applications.

Published
2023
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