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Nanomaterials 2018, 8(6), 421; https://doi.org/10.3390/nano8060421

Interfacial Model and Characterization for Nanoscale ReB2/TaN Multilayers at Desired Modulation Period and Ratios: First-Principles Calculations and Experimental Investigations

1,2
and
1,2,*
1
College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China
2
Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials, Tianjin 300387, China
*
Author to whom correspondence should be addressed.
Received: 7 May 2018 / Revised: 2 June 2018 / Accepted: 6 June 2018 / Published: 10 June 2018
(This article belongs to the Special Issue Design and Development of Nanostructured Thin Films)
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Abstract

The interfacial structure of ReB2/TaN multilayers at varied modulation periods (Λ) and modulation ratios (tReB2:tTaN) was investigated using key experiments combined with first-principles calculations. A maximum hardness of 38.7 GPa occurred at Λ = 10 nm and tReB2:tTaN = 1:1. The fine nanocrystalline structure with small grain sizes remained stable for individual layers at Λ= 10 nm and tReB2:tTaN = 1:1. The calculation of the interfacial structure model and interfacial energy was performed using the first principles to advance the in-depth understanding of the relationship between the mechanical properties, residual stresses, and the interfacial structure. The B-Ta interfacial configuration was calculated to have the highest adsorption energy and the lowest interfacial energy. The interfacial energy and adsorption energy at different tReB2:tTaN followed the same trend as that of the residual stress. The 9ReB2/21TaN interfacial structure in the B-Ta interfacial configuration was found to be the most stable interface in which the highest adsorption energy and the lowest interfacial energy were obtained. The chemical bonding between the neighboring B atom and the Ta atom in the interfaces showed both covalency and iconicity, which provided a theoretical interpretation of the relationship between the residual stress and the stable interfacial structure of the ReB2/TaN multilayer. View Full-Text
Keywords: ReB2/TaN multilayers; modulation structure; first-principles calculation; interfacial model; adsorption energy; interfacial energy ReB2/TaN multilayers; modulation structure; first-principles calculation; interfacial model; adsorption energy; interfacial energy
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Jin, S.; Li, D. Interfacial Model and Characterization for Nanoscale ReB2/TaN Multilayers at Desired Modulation Period and Ratios: First-Principles Calculations and Experimental Investigations. Nanomaterials 2018, 8, 421.

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