Surface and Grain Boundary Energies as well as Surface Mass Transport in Polycrystalline MgO

Chatzimichail, Rallou; Christogerou, Angeliki; Bebelis, S.; Nikolopoulos, P.

doi:10.1007/s11665-021-06120-5

Cited by 3 publications

(2 citation statements)

References 61 publications

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“…For MgO, the surface energy is ranked in the descending order as (111) > (110) > (100), indicating that the growth rate in the 〈111〉 direction is the fastest. 28,29 Therefore, some MgO nanowires tend to turn to the 〈111〉 direction when the growth conditions are disturbed. As a matter of fact, altering of the growth direction has been achieved in epitaxially grown TiO 2 nanowires by varying the material flux, which is interpreted in terms of a minimum free energy in all interfaces.…”

Section: Resultsmentioning

confidence: 99%

Epitaxial growth of aligned MgO nanowire arrays on a single crystalline substrate

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Epitaxial growth of aligned MgO nanowire arrays on a single crystalline substrate

et al. 2022

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“…Chatzimichail et al [ 57 ] determined the temperature dependence of the surface energy and the grain boundary energy of polycrystalline MgO, as well as of the interfacial energy of MgO in contact with liquid Ag and Cu. They studied the mechanism and the kinetics of mass transport in the grooving process at the grain boundaries/free surface intersection of MgO.…”

Section: Introductionmentioning

confidence: 99%

A New Solution to the Grain Boundary Grooving Problem in Polycrystalline Thin Films When Evaporation and Diffusion Meet in Power Electronic Devices

Hamieh,

Ibrahim,

Khatir

2024

Micromachines

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This paper constituted an extension of two previous studies concerning the mathematical development of the grain boundary grooving in polycrystalline thin films in the cases of evaporation/condensation and diffusion taken separately. The thermal grooving processes are deeply controlled by the various mass transfer mechanisms of evaporation–condensation, surface diffusion, lattice diffusion, and grain boundary diffusion. This study proposed a new original analytical solution to the mathematical problem governing the grain groove profile in the case of simultaneous effects of evaporation–condensation and diffusion in polycrystalline thin films by resolving the corresponding fourth-order partial differential equation ∂y∂t=C∂2y∂x2−B∂4y∂x4 obtained from the approximation ∂y∂x2≪1. The comparison of the new solution to that of diffusion alone proved an important effect of the coupling of evaporation and diffusion on the geometric characteristics of the groove profile. A second analytical solution based on the series development was also proposed. It was proved that changes in the boundary conditions of the grain grooving profile largely affected the different geometric characteristics of the groove profile.

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Evaluating the Mechanical and Tribological Properties of DLC Nanocoated Aluminium 5051 Using RF Sputtering

Natrayan

Merneedi

Dhinakaran³

et al. 2021

Journal of Nanomaterials

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The diamond-like carbon- (DLC-) coating technique is used in the sliding parts of automotive engines, among other applications, to reduce friction and wear. In this work, DLC has been coated on the Aluminium 5051 sample to assess the mechanical and tribological properties. A sputtering deposition mechanism is used, and the DLC is coated using a graphite target. The developed DLC coatings are tested for adhesion strength, hardness, chemical composition using XRD, and wear behaviour. The developed DLC thin films have considerably increased the wear behaviour of the Aluminium 5051 sample and have fulfilled the objective of this study. The XRD data indicated the presence of amorphous carbon in the coating with a threefold increase to the hardness of the naked aluminium. This study provides insight into improving the aluminium wear resistance by developing a considerably hard coating.

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Surface and Grain Boundary Energies as well as Surface Mass Transport in Polycrystalline MgO

Cited by 3 publications

References 61 publications

Epitaxial growth of aligned MgO nanowire arrays on a single crystalline substrate

Epitaxial growth of aligned MgO nanowire arrays on a single crystalline substrate

A New Solution to the Grain Boundary Grooving Problem in Polycrystalline Thin Films When Evaporation and Diffusion Meet in Power Electronic Devices

Evaluating the Mechanical and Tribological Properties of DLC Nanocoated Aluminium 5051 Using RF Sputtering

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