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Open AccessArticle

Calculation of Surface Properties of Cubic and Hexagonal Crystals through Molecular Statics Simulations

by Zihan Tang 1, Yue Chen 1 and Wei Ye 1,2,*
1
College of Aerospace Engineering, Chongqing University, Chongqing 400044, China
2
Chongqing Key Laboratory of Heterogeneous Material Mechanics, Chongqing University, Chongqing 400044, China
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(4), 329; https://doi.org/10.3390/cryst10040329
Received: 24 March 2020 / Revised: 18 April 2020 / Accepted: 20 April 2020 / Published: 22 April 2020
(This article belongs to the Special Issue Study Properties of Hexagonal Single Crystals and Polycrystals)
Surface property is an important factor that is widely considered in crystal growth and design. It is also found to play a critical role in changing the constitutive law seen in the classical elasticity theory for nanomaterials. Through molecular static simulations, this work presents the calculation of surface properties (surface energy density, surface stress and surface stiffness) of some typical cubic and hexagonal crystals: face-centered-cubic (FCC) pure metals (Cu, Ni, Pd and Ag), body-centered-cubic (BCC) pure metals (Mo and W), diamond Si, zincblende GaAs and GaN, hexagonal-close-packed (HCP) pure metals (Mg, Zr and Ti), and wurzite GaN. Sound agreements of the bulk and surface properties between this work and the literature are found. New results are first reported for the surface stiffness of BCC pure metals, surface stress and surface stiffness of HCP pure metals, Si, GaAs and GaN. Comparative studies of the surface properties are carried out to uncover trends in their behaviors. The results in this work could be helpful to the investigation of material properties and structure performances of crystals. View Full-Text
Keywords: surface energy density; surface stress; surface stiffness; molecular statics simulations surface energy density; surface stress; surface stiffness; molecular statics simulations
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Tang, Z.; Chen, Y.; Ye, W. Calculation of Surface Properties of Cubic and Hexagonal Crystals through Molecular Statics Simulations. Crystals 2020, 10, 329.

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