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Your search keyword '"Zhi-Yong, Zhang"' showing total 12 results
Start Over Author "Zhi-Yong, Zhang" Journal chinese physics letters
12 results on '"Zhi-Yong, Zhang"'

1. Direct Observation of Domain-Inverted Regions in Proton-Exchanged LiNbO 3 Using Transmission Electron Microscopy

Author

Yong-Yuan Zhu, Zhi-yong Zhang, Shining Zhu, Naiben Min, and Lu-chun Wang

Subjects
Conventional transmission electron microscope, Materials science, Physics::Instrumentation and Detectors, business.industry, Direct observation, Scanning confocal electron microscopy, General Physics and Astronomy, Molecular physics, Condensed Matter::Materials Science, Optics, Electron tomography, Transmission electron microscopy, Czochralski method, Energy filtered transmission electron microscopy, business, Crystal twinning
Abstract

Direct observation of the domain-inverted regions in LiNbO3 formed by proton exchange followed by heat treatment is performed by using transmission electron microscopy. A charged straight 180° twinning domain boundary was revealed and compared with winding domain boundaries in LiNbO3 grown by Czochralski method. Obtained results are significant to studying the mechanism of domain inversion and morphology of inversion domains.

Published
1996

11. The Field Emission Characteristics of Titanium-Doped Nano-Diamonds.

Author

Yan-Ning, Yang, Zhi-Yong, Zhang, Fu-Chun, Zhang, Jun-Tang, Dong, Wu, Zhao, Chun-Xue, Zhai, and Wei-Hu, Zhang

Subjects
*FIELD emission, *TITANIUM, *NANODIAMONDS, *ELECTROPHORESIS, *SOLUTION (Chemistry), *SUBSTRATES (Materials science), *SURFACES (Technology), *SCANNING electron microscopy, *RAMAN spectroscopy
Abstract

An electrophoresis solution, prepared in a specific ratio of titanium (Ti)-doped nano-diamond, is dispersed by ultrasound and the nano-diamond coating is then deposited on a polished Ti substrate by electrophoresis. After high-temperature vacuum annealing, the appearance of the surface and the microstructures of the coating are observed by a metallomicroscope, scanning electron microscopy and Raman spectroscopy. The field emission characteristics and luminescence features are also tested, and the mechanism of the field emission characteristics of the Ti-doped nano-diamond is analyzed. The experimental results show that under the same conditions, the diamond-coated surface (by deposition) is more uniform after doping with 5mg of Ti powder. Compared with the undoped nano-diamond cathode, the turn-on fields decline from 6.95 to 5.95 V/&mgr;m. When the electric field strength is 13.80 V/&mgr;m, the field emission current density increases to 130.00 &mgr;A/cm2. Under the applied fields, the emission current is stable and the luminescence is at its best, while the field emission characteristics of the 10mg Ti-doped coating become worse, as does the luminescence. The reason for this could be that an excessive amount of TiC is generated on the surface of the coating. [ABSTRACT FROM AUTHOR]

Published
2012
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