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507 results on '"Liu, Zhenxian"'

151. Publisher’s Note: Bulk Signatures of Pressure-Induced Band Inversion and Topological Phase Transitions inPb1−xSnxSe[Phys. Rev. Lett.113, 096401 (2014)]

Author

Xi, Xiaoxiang, primary, He, Xu-Gang, additional, Guan, Fen, additional, Liu, Zhenxian, additional, Zhong, R. D., additional, Schneeloch, J. A., additional, Liu, T. S., additional, Gu, G. D., additional, Du, X., additional, Chen, Z., additional, Hong, X. G., additional, Ku, Wei, additional, and Carr, G. L., additional

Published
2014
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160. Bandgap closure and reopening inCsAuI3at high pressure

Author

Wang, Shibing, primary, Kemper, Alexander F., additional, Baldini, Maria, additional, Shapiro, M. C., additional, Riggs, Scott C., additional, Zhao, Zhao, additional, Liu, Zhenxian, additional, Devereaux, Thomas P., additional, Geballe, Ted H., additional, Fisher, Ian R., additional, and Mao, Wendy L., additional

Published
2014
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163. Synchrotron X-ray diffraction and infrared spectroscopy studies of C60H18 under high pressure

Author

Ma, Honglei, Zhang, Xuemei, Liu, Bingbing, Li, Quanjun, Zeng, Qifeng, Yu, Shidan, Zou, Bo, Cui, Tian, Zou, Guangtian, Liu, Zhenxian, Wågberg, Thomas, Sundqvist, Bertil, Noreus, Dag, Ma, Honglei, Zhang, Xuemei, Liu, Bingbing, Li, Quanjun, Zeng, Qifeng, Yu, Shidan, Zou, Bo, Cui, Tian, Zou, Guangtian, Liu, Zhenxian, Wågberg, Thomas, Sundqvist, Bertil, and Noreus, Dag

Abstract

In situ high-pressure angle-dispersive synchrotron X-ray diffraction and high-pressure mid-infrared (IR) spectrum measurements of C60H18 were carried out up to 32 and 10.2 GPa, respectively. Our diffraction data indicated that the fcc structure of C60H18 was stable up to 32 GPa. The bulk modulus B0 was determined to be 21 ± 1.16 GPa, about 40% higher than that of C60. The C−H vibrations still existed up to 10.2 GPa, and the vibrational frequencies decreased with increasing pressure. IR-active vibrational frequencies and their corresponding eigenvectors of C60H18 were simulated by DMOL3. The effects of the hydrogen atoms attached to the fullerene molecular cage on the stability of the structure under high pressure are discussed.

Published
2010
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164. High pressure raman spectra of melamine (C3H6N6) and pressure induced transition

Author

Liu Zhenxian, Cui Qi-Liang, Zhang Zhaojin, Zou Guang-Tian, Zhao Yongnian, and LI Dong-Mei

Subjects
Phase transition, symbols.namesake, chemistry.chemical_compound, Chemistry, High pressure, Phase (matter), Analytical chemistry, symbols, Condensed Matter Physics, Raman spectroscopy, Melamine
Abstract

High pressure Raman spectra of Melamine (C3H6N6) have been studied up to 8.7 GPa. The pressure effect on Raman spectra reveals that the discrepancy between intra and inter-molecule bonds tends to shrink with increasing pressure. The experimental results show that Melamine probably undergoes two structural transitions at 2 and 6 GPa respectively and the structure of the new phase has C1 1 i symmetry probably at 2GPa

Published
1990
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165. Dependence of the annihilation pressure of ruby R-line fluorescence on the laser exciting wavelength

Author

Liu Zhenxian, Zou Guang-Tian, and Cui Qi-Liang

Subjects
Annihilation, Argon, Chemistry, Analytical chemistry, chemistry.chemical_element, Diamond, macromolecular substances, engineering.material, Condensed Matter Physics, Laser, Fluorescence, Diamond anvil cell, law.invention, Wavelength, stomatognathic system, law, engineering, Line (formation)
Abstract

Using solid argon as pressure medium, quasi-hydrostatic pressure was obtained at room temperature in the diamond cell up to 90 GPa. The mechanism of the disappearance of ruby R lines and the applicability of ruby pressure scale under quasi-hydrostatic pressure above 100 GPa was discussed. The deviation of every pressure measured at nine positions in the cell per mean pressure was less than 1.5% at pressure below 80 GPa.

Published
1990
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173. Polymerization of Acetonitrile via a Hydrogen Transfer Reaction from CH3 to CN under Extreme Conditions.

Author

Zheng, Haiyan, Li, Kuo, Cody, George D., Tulk, Christopher A., Dong, Xiao, Gao, Guoying, Molaison, Jamie J., Liu, Zhenxian, Feygenson, Mikhail, Yang, Wenge, Ivanov, Ilia N., Basile, Leonardo, Idrobo, Juan ‐ Carlos, Guthrie, Malcolm, and Mao, Ho ‐ kwang

Subjects
ACETONITRILE, POLYMERIZATION, HYDROGEN transfer reactions, TRIPLE bonds (Chemistry), COVALENT bonds, ATOM transfer reactions
Abstract

Acetonitrile (CH3CN) is the simplest and one of the most stable nitriles. Reactions usually occur on the C≡N triple bond, while the C−H bond is very inert and can only be activated by a very strong base or a metal catalyst. It is demonstrated that C−H bonds can be activated by the cyano group under high pressure, but at room temperature. The hydrogen atom transfers from the CH3 to CN along the CH⋅⋅⋅N hydrogen bond, which produces an amino group and initiates polymerization to form a dimer, 1D chain, and 2D nanoribbon with mixed sp2 and sp3 bonded carbon. Finally, it transforms into a graphitic polymer by eliminating ammonia. This study shows that applying pressure can induce a distinctive reaction which is guided by the structure of the molecular crystal. It highlights the fact that very inert C−H can be activated by high pressure, even at room temperature and without a catalyst. [ABSTRACT FROM AUTHOR]

Published
2016
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175. Crossing the Insulator-to-Metal Barrier with a Thiazyl Radical Conductor

Author

Mailman, Aaron, primary, Winter, Stephen M., additional, Yu, Xin, additional, Robertson, Craig M., additional, Yong, Wenjun, additional, Tse, John S., additional, Secco, Richard A., additional, Liu, Zhenxian, additional, Dube, Paul A., additional, Howard, Judith A. K., additional, and Oakley, Richard T., additional

Published
2012
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184. High-pressure study of silane to 150 GPa

Author

Strobel, Timothy A., primary, Goncharov, Alexander F., additional, Seagle, Christopher T., additional, Liu, Zhenxian, additional, Somayazulu, Maddury, additional, Struzhkin, Viktor V., additional, and Hemley, Russell J., additional

Published
2011
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