Speciation and thermodynamic properties of zinc in sulfur-rich hydrothermal fluids: Insights from ab initio molecular dynamics simulations and X-ray absorption spectroscopy

2016 ◽  
Vol 179 ◽  
pp. 32-52 ◽  
Author(s):  
Yuan Mei ◽  
Barbara Etschmann ◽  
Weihua Liu ◽  
David M. Sherman ◽  
Denis Testemale ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Thermodynamic Properties ◽  
Ab Initio ◽  
Molecular Dynamics Simulations ◽  
Absorption Spectroscopy ◽  
Hydrothermal Fluids ◽  
Ab Initio Molecular Dynamics ◽  
X Ray ◽  
Dynamics Simulations ◽  
X Ray Absorption

scholarly journals Study of High-Temperature Behaviour of ZnO by Ab Initio Molecular Dynamics Simulations and X-ray Absorption Spectroscopy

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5206
Author(s):  
Dmitry Bocharov ◽  
Inga Pudza ◽  
Konstantin Klementiev ◽  
Matthias Krack ◽  
Alexei Kuzmin
Keyword(s):  
Molecular Dynamics ◽  
High Temperature ◽  
Ab Initio ◽  
Ab Initio Molecular Dynamics ◽  
Mean Square ◽  
Structural Anisotropy ◽  
X Ray ◽  
Temperature Dependences ◽  
Dynamics Simulations ◽  
X Ray Absorption

Wurtzite-type zinc oxide (w-ZnO) is a widely used material with a pronounced structural anisotropy along the c axis, which affects its lattice dynamics and represents a difficulty for its accurate description using classical models of interatomic interactions. In this study, ab initio molecular dynamics (AIMD) was employed to simulate a bulk w-ZnO phase in the NpT ensemble in the high-temperature range from 300 K to 1200 K. The results of the simulations were validated by comparison with the experimental Zn K-edge extended X-ray absorption fine structure (EXAFS) spectra and known diffraction data. AIMD NpT simulations reproduced well the thermal expansion of the lattice, and the pronounced anharmonicity of Zn–O bonding was observed above 600 K. The values of mean-square relative displacements and mean-square displacements for Zn–O and Zn–Zn atom pairs were obtained as a function of interatomic distance and temperature. They were used to calculate the characteristic Einstein temperatures. The temperature dependences of the O–Zn–O and Zn–O–Zn bond angle distributions were also determined.

Solvation of Zn2+ ion in 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids: a molecular dynamics and X-ray absorption study

2019 ◽  
Vol 21 (13) ◽  
pp. 6958-6969 ◽  
Author(s):  
Matteo Busato ◽  
Paola D’Angelo ◽  
Andrea Melchior
Keyword(s):  
Molecular Dynamics ◽  
Ionic Liquids ◽  
Molecular Dynamics Simulations ◽  
Absorption Spectroscopy ◽  
Absorption Study ◽  
X Ray ◽  
Dynamics Simulations ◽  
X Ray Absorption

Molecular dynamics simulations and X-ray absorption spectroscopy were employed to study Zn2+ ions in [Cnmim][Tf2N] (n = 2, 4).

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