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Wu W, Zhang L, Liu S, Ren H, Zhou X, Li H. Liquid–Liquid Phase Transition in Nanoconfined Silicon Carbide. J Am Chem Soc 2016; 138:2815-22. [DOI: 10.1021/jacs.5b13467] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Weikang Wu
- Key
Laboratory for Liquid−Solid Structural Evolution and Processing
of Materials, Ministry of Education, Shandong University, Jinan 250061, People’s Republic of China
| | - Leining Zhang
- Key
Laboratory for Liquid−Solid Structural Evolution and Processing
of Materials, Ministry of Education, Shandong University, Jinan 250061, People’s Republic of China
| | - Sida Liu
- Key
Laboratory for Liquid−Solid Structural Evolution and Processing
of Materials, Ministry of Education, Shandong University, Jinan 250061, People’s Republic of China
| | - Hongru Ren
- Key
Laboratory for Liquid−Solid Structural Evolution and Processing
of Materials, Ministry of Education, Shandong University, Jinan 250061, People’s Republic of China
| | - Xuyan Zhou
- Key
Laboratory for Liquid−Solid Structural Evolution and Processing
of Materials, Ministry of Education, Shandong University, Jinan 250061, People’s Republic of China
| | - Hui Li
- Key
Laboratory for Liquid−Solid Structural Evolution and Processing
of Materials, Ministry of Education, Shandong University, Jinan 250061, People’s Republic of China
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Shen B, Wang ZY, Dong F, Guo YR, Zhang RJ, Zheng YX, Wang SY, Wang CZ, Ho KM, Chen LY. Dynamics and Diffusion Mechanism of Low-Density Liquid Silicon. J Phys Chem B 2015; 119:14945-51. [PMID: 26540341 DOI: 10.1021/acs.jpcb.5b09138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A first-order phase transition from a high-density liquid to a low-density liquid has been proposed to explain the various thermodynamic anomies of water. It also has been proposed that such liquid-liquid phase transition would exist in supercooled silicon. Computer simulation studies show that, across the transition, the diffusivity drops roughly 2 orders of magnitude, and the structures exhibit considerable tetrahedral ordering. The resulting phase is a highly viscous, low-density liquid silicon. Investigations on the atomic diffusion of such a novel form of liquid silicon are of high interest. Here we report such diffusion results from molecular dynamics simulations using the classical Stillinger-Weber (SW) potential of silicon. We show that the atomic diffusion of the low-density liquid is highly correlated with local tetrahedral geometries. We also show that atoms diffuse through hopping processes within short ranges, which gradually accumulate to an overall random motion for long ranges as in normal liquids. There is a close relationship between dynamical heterogeneity and hopping process. We point out that the above diffusion mechanism is closely related to the strong directional bonding nature of the distorted tetrahedral network. Our work offers new insights into the complex behavior of the highly viscous low density liquid silicon, suggesting similar diffusion behaviors in other tetrahedral coordinated liquids that exhibit liquid-liquid phase transition such as carbon and germanium.
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Affiliation(s)
- B Shen
- Key Laboratory of Micro and Nano Photonic Structures (MoE) and Department of Optical Science and Engineering, Fudan University , Shanghai, 200433, China.,Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University , Ames, Iowa 50011, United States
| | - Z Y Wang
- Key Laboratory of Micro and Nano Photonic Structures (MoE) and Department of Optical Science and Engineering, Fudan University , Shanghai, 200433, China
| | - F Dong
- Key Laboratory of Micro and Nano Photonic Structures (MoE) and Department of Optical Science and Engineering, Fudan University , Shanghai, 200433, China
| | - Y R Guo
- Key Laboratory of Micro and Nano Photonic Structures (MoE) and Department of Optical Science and Engineering, Fudan University , Shanghai, 200433, China
| | - R J Zhang
- Key Laboratory of Micro and Nano Photonic Structures (MoE) and Department of Optical Science and Engineering, Fudan University , Shanghai, 200433, China
| | - Y X Zheng
- Key Laboratory of Micro and Nano Photonic Structures (MoE) and Department of Optical Science and Engineering, Fudan University , Shanghai, 200433, China
| | - S Y Wang
- Key Laboratory of Micro and Nano Photonic Structures (MoE) and Department of Optical Science and Engineering, Fudan University , Shanghai, 200433, China.,Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University , Ames, Iowa 50011, United States.,Key Laboratory for Information Science of Electromagnetic Waves (MoE) , Shanghai, 200433, China
| | - C Z Wang
- Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University , Ames, Iowa 50011, United States
| | - K M Ho
- Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University , Ames, Iowa 50011, United States
| | - L Y Chen
- Key Laboratory of Micro and Nano Photonic Structures (MoE) and Department of Optical Science and Engineering, Fudan University , Shanghai, 200433, China
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Zhao G, Yu YJ, Tan XM. Nature of the first-order liquid-liquid phase transition in supercooled silicon. J Chem Phys 2015; 143:054508. [DOI: 10.1063/1.4928194] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- G. Zhao
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People’s Republic of China
| | - Y. J. Yu
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People’s Republic of China
| | - X. M. Tan
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People’s Republic of China
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Ayrinhac S, Gauthier M, Le Marchand G, Morand M, Bergame F, Decremps F. Thermodynamic properties of liquid gallium from picosecond acoustic velocity measurements. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:275103. [PMID: 26061830 DOI: 10.1088/0953-8984/27/27/275103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Due to discrepancies in the literature data the thermodynamic properties of liquid gallium are still in debate. Accurate measurements of adiabatic sound velocities as a function of pressure and temperature have been obtained by the combination of laser picosecond acoustics and surface imaging on sample loaded in diamond anvil cell. From these results the thermodynamic parameters of gallium have been extracted by a numerical procedure up to 10 GPa and 570 K. It is demonstrated that a Murnaghan equation of state accounts well for the whole data set since the isothermal bulk modulus BT has been shown to vary linearly with pressure in the whole temperature range. No evidence for a previously reported liquid-liquid transition has been found in the whole pressure and temperature range explored.
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Affiliation(s)
- S Ayrinhac
- Institut de Minéralogie de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Universités-UPMC Université Pierre et Marie Curie Paris 6, CNRS UMR 7590, Muséum National d'Histoire Naturelle, IRD UMR 206, BC 115, 4 place Jussieu, 75252 PARIS Cedex 05 France
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