Qin Zhang

University of Electronic Science and Technology of China

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Hua Su

University of Electronic Science and Technology of China

Yuanxun Li

University of Electronic Science and Technology of China

Xiaoli Tang

National Engineering Research Center of Electromagnetic Radiation Control Materials

Alan Seabaugh

University of Notre Dame

Fangyi Huang

University of Electronic Science and Technology of China

Xiaohui Wu

Huazhong University of Science and Technology

Huili Grace Xing

Cornell University

Yulan Jing

University of Electronic Science and Technology of China

Guangle Zhou

Institute of Forensic Science

Yuanming Lai

Chengdu University of Technology

Cooperative Institutions

University of Electronic Science and Technology of China

Chinese Academy of Sciences

National Engineering Research Center of Electromagnetic Radiation Control Materials

University of Notre Dame

University of Chinese Academy of Sciences

State Key Laboratory of Electronic Thin Films and Integrated Devices

Huaqiao University

Chengdu University

Central South University

Sichuan University

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Relationship Between Maladaptive Cognition and Internet Addiction in Chinese Adolescents: Moderated Mediation Analysis of Online Motivation and Effortful Control

International Journal of Mental Health and Addiction (2018)

Qin Zhang Yun Wang Yuhan Luo Weixi Zeng Qian Cui

Health psychology

Addictive behavior

Moderated mediation

10.1007/s11469-018-9965-x

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Citations (7)

Improved microwave dielectric properties of MgAl₂O₄ spinel ceramics through (Li_1/3Ti_2/3)³⁺ doping

Chinese Physics B (2022)

Xiao Li Xizhi Yang Yuanming Lai Qin Zhang Baoyang Li

A series of nominal compositions MgAl 2− x (Li 1/3 Ti 2/3 ) x O 4 ( x = 0, 0.04, 0.08, 0.12, 0.16, and 0.20) ceramics were successfully prepared via the conventional solid-state reaction route. The phase compositions, microstructures, and microwave dielectric properties were investigated. The results of x-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that a single phase of MgAl 2− x (Li 1/3 Ti 2/3 ) x O 4 ceramics with a spinel structure was obtained at x ≤ 0.12, whereas the second phase of MgTi 2 O 5 appeared when x > 0.12. The cell parameters were obtained by XRD refinement. As the x values increased, the unit cell volume kept expanding. This phenomenon could be attributed to the partial substitution of (Li 1/3 Ti 2/3 ) 3+ for Al 3+ . Results showed that (Li 1/3 Ti 2/3 ) 3+ doping into MgAl 2 O 4 spinel ceramics effectively reduced the sintering temperature and improved the quality factor ( Q f ) values. Good microwave dielectric properties were achieved for a sample at x = 0.20 sintering at 1500 °C in air for 4 h: dielectric constant ε r = 8.78, temperature coefficient of resonant frequency τ f = −85 ppm/°C, and Q f = 62 300 GHz. The Q f value of the x = 0.20 sample was about 2 times higher than that of pure MgAl 2 O 4 ceramics (31600 GHz). Thus, MgAl 2− x (Li 1/3 Ti 2/3 ) x O 4 ceramics with excellent microwave dielectric properties can be applied to 5G communications.

Temperature coefficient

10.1088/1674-1056/ac81a8

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Amelioration of sintering and multi-frequency dielectric properties of Mg3B2O6: A mechanism study of nickel substitution using DFT calculation

Journal of Advanced Ceramics (2021)

Rui Peng Yongcheng Lu Qin Zhang Yuanming Lai Guoliang Yu

Abstract With the support of density functional theory (DFT) calculation, the amelioration of sintering and dielectric properties of the Mg 3 B 2 O 6 (MBO) ceramic was realized through the substitution of magnesium with nickel. The TE-mode cylindrical cavity method was used to measure the dielectric properties at different frequencies. The thermo-mechanical analysis and simultaneous thermal analysis were used to characterize the chemical and mechanical properties. The phase composition was determined through the X-ray diffraction (XRD) and Raman spectrum. The microstructure was investigated using the scanning electron microscopy (SEM). Magnesium substitution with nickel (4 mol%) could ionize the B-O bond of BO 3 , modify the vibration mode, improve the order degree, densify the microstructure, decrease the intrinsic densification temperature, and ameliorate the dielectric properties of the MBO ceramics. The maximum values were achieved for the ceramics with 4 mol% nickel and sintered at 1175 °C, that is, 97.2% for relative density, 72,600 GHz (10 GHz), 75,600 GHz (11.4 GHz), and 92,200 GHz (15 GHz) for Q × f , 7.1 (10 GHz), 7.01 (11.4 GHz), and 6.91 (15 GHz) for ε r , and −56.3 ppm/°C for τ f .

10.1007/s40145-021-0515-9

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STUDY ON BURNING BEHAVIOR OF AUSTRALIAN COAL AND ITS APPLICATION ONTO 600MW UNITS

Thermal Power Generation (2010)

Qin Zhang

Australian coal is a high grade coal sort,boasting high volatile matter content,high calorific value,and low ash content.Results of analysis in laboratory and in practical mixedly burning test show that the coal quality parameters and teh burning behavior of said australian coal is close to those of the mixed-Shen coal sort.In application onto large-scale boilers,it is a comparatively ideal altenative coal sort for the mixed-Shen coal sort.However,the slagging tendency of said australian coal is somewhat stronger,needing to pay attention in the practical burning process.

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Structural Sensitivity of Interband Tunnel Diodes for SRAM

Device Research Conference (2008)

Surajit Sutar Qin Zhang Alan Seabaugh

Here, we present a study to outline the design space and trade-offs for high PVCR, low-voltage, low-current tunnel diodes with best results for peak currents and voltages being 4.3 nA/mum ² , 50 mV with PVCR of 15, and demonstrate a fabrication process yielding submicron interband tunnel diodes for the first time. The PVCR of submicron diodes is observed to degrade for submicron device mesas indicating the need for passivation to maintain the PVCR.

Passivation

PIN diode

10.1109/drc.2008.4800736

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Citations (5)

Response to “Comment on ‘Zener tunneling semiconducting nanotubes and graphene nanoribbon p-n junctions’” [Appl. Phys. Lett. 101, 256103 (2012)]

Applied Physics Letters (2012)

Debdeep Jena Tian Fang Qin Zhang Huili Grace Xing

First Page

Zener diode

10.1063/1.4766741

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Cu2+-Ion-Substitution-Driven Microstructure and Microwave Dielectric Properties of Mg1−xCuxAl2O4 Ceramics

Nanomaterials (2022)

Yuanming Lai Ming Yin Baoyang Li Xizhi Yang Weiping Gong

In this work, Cu-substituted MgAl2O4 ceramics were prepared via solid-state reaction. The crystal structure, cation distribution, and microwave dielectric properties of Mg1-xCuxAl2O4 ceramics were investigated. Cu2+ entered the MgAl2O4 lattice and formed a spinel structure. The substitution of Cu2+ ions for Mg2+ ions contributed to Al3+ ions preferential occupation of the octahedron and changed the degree of inversion. The quality factor (Qf) value, which is correlated with the degree of inversion, increased to a maximum value at x = 0.04 and then decreased. Ionic polarizability and relative density affected the dielectric constant (εr) value. The temperature coefficient of the resonant frequency (τf) value, which was dominated by the total bond energy, generally shifted to the positive direction. Satisfactory microwave dielectric properties were achieved in x = 0.04 and sintered at 1550 °C: εr = 8.28, Qf = 72,800 GHz, and τf = -59 ppm/°C. The Mg1-xCuxAl2O4 solid solution, possessing good performance, has potential for application in the field of modern telecommunication technology.

Temperature coefficient

10.3390/nano12193332

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A Novel Ka-Band Planar Balun Using Microstrip-CPS-Microstrip Transition

IEEE Microwave and Wireless Components Letters (2011)

Peng Wu Yong Zhang Yuliang Dong Qin Zhang

In this letter, a novel wideband 180 $^{\circ}$ phase shifter with excellent phase and amplitude balance is presented and a new wideband millimeter-wave planar balun is proposed for the first time. The proposed balun consists of a wideband Wilkinson divider for power splitting followed by two microstrip-coplanar stripline (CPS)-microstrip transitions for broadband 180 $^{\circ}$ phase shift. Good broadband phase and amplitude balance performances are achieved according to the inherent wideband characteristics of the Wilkinson divider and microstrip-CPS-microstrip transition and symmetry of the structure. A new ka-band planar balun has been fabricated and measured. Measured results show that the return loss, isolation, amplitude imbalance, and phase imbalance are better than 10 dB, 14.4 dB, 0.8 dB, and 3.1 $^{\circ}$ , respectively, over the specified frequency range from 26.5 to 40 GHz.

Balun

Wideband

Phase shift module

Stripline

10.1109/lmwc.2010.2104315

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Citations (15)

AlGaSb/InAs Tunnel Field-Effect Transistor With On-Current of 78 $\mu\hbox{A}/\mu\hbox{m}$ at 0.5 V

IEEE Electron Device Letters (2012)

Rui Li Yeqing Lu Guangle Zhou Qingmin Liu Soo Doo Chae

Record high on-current of 78 $\mu\hbox{A}/\mu\hbox{m}$ in a tunnel field-effect transistor (TFET) is achieved at 0.5 V at room temperature. The TFET employs a staggered AlGaSb/InAs heterojunction with the tunneling direction oriented in-line with the gate field. The measured results are consistent with numerical simulation of the device structure. Simulations of optimized structures suggest that switching speed comparable to that of the MOSFET should be achievable with improvements in the source and drain resistances.

Tunnel field-effect transistor

10.1109/led.2011.2179915

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Citations (134)

Low loss and good chemical compatibility with silver electrodes of Cu2+-substituted Ba3Ti4Nb4O21 ceramics realizing low temperature co-fired ceramics technology: Crystal structure, vibration modes and chemical bonds studies

Journal of the European Ceramic Society (2022)

Xiaohui Wu Qin Zhang Fangyi Huang Xingyu Huo Fuyu Li

Dielectric loss

10.1016/j.jeurceramsoc.2022.04.051

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Citations (23)