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Your search keyword '"Duan, Zhenxing"' showing total 4 results
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4 results on '"Duan, Zhenxing"'

2. Enhancing bromine-doped CuBiI4 photodetectors through charge dynamics and conductivity analysis.

Author

Duan, Zhenxing, Shu, Yinying, Liu, Yanjie, Hu, Jundie, Qu, Jiafu, Gong, Meiying, Zhang, Zhichao, Sun, Wei, Yang, Xiaogang, and Li, Chang Ming

Abstract

Lead-free perovskite-like semiconductors exhibit promising optoelectronic properties for various applications, including signal detection. However, the photocurrent density in these materials is often constrained by limitations in photogenerated charge dynamics. In this study, we introduced bromine dopants into CuBiI4 crystalline films for the first time and observed a significant enhancement in photocurrent density, increasing by approximately 4.8 times compared to undoped CuBiI4. Through comprehensive investigations into band structures, charge separation, and recombination dynamics, we elucidated the mechanisms underlying this enhancement, which proved to have a profound impact on charge densities. Specifically, the internal generation of photocharge densities was found to be influenced by several factors. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Fabrication and performance of Al2O3/(W,Ti)C+Al2O3/TiC multilayered ceramic cutting tools

Author

Yun Dongling, Zhao Jun, Ai Xing, Zhang Hui, Duan Zhenxing, and Deng Jianxin

Subjects
Titanium carbide, Materials science, Cutting tool, Mechanical Engineering, Condensed Matter Physics, Hot pressing, chemistry.chemical_compound, Fracture toughness, chemistry, Mechanics of Materials, Residual stress, Tungsten carbide, visual_art, Ultimate tensile strength, visual_art.visual_art_medium, General Materials Science, Ceramic, Composite material
Abstract

Al2O3/(W,Ti)C + Al2O3/TiC multilayered ceramic cutting tools with different thickness ratios were produced by hot pressing. The residual stresses inside the layered materials during fabrication were calculated by means of the finite element method. The mechanical properties at the outer layer of the layered materials were measured. The cutting performance of the layered tools was investigated and compared with an unstressed reference tool. Results showed that multilayered structure in AWT + AT layered ceramic materials can induce excess residual stresses during fabrication. These residual stresses are compressive in the AWT outer layer and tensile in the AT internal layer. The fracture toughness at the outer layer of the layered ceramic materials is greatly improved compared with that of the stress-free one. These multilayered tools can minimize the flank wear and edge chipping compared with the stress-free tool. The mechanisms responsible were determined to be the formation of compressive residual stress on the outer layer of the layered tools, which led to an increase in resistance to fracture. Thickness ratios were found to have a profound effect on the residual stresses, the fracture toughness, and the cutting performance of the layered tools.

Published
2010

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