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Stoichiometric amorphous boron carbide (BC)

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info:eu-repo/semantics/closedAccess

Date

01.10.2020

Author

Yildiz, Tevhide Ayca
Durandurdu, Murat

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Abstract

In this work, a stoichiometric amorphous boron carbide (a-BC) network is constructed via an ab initio molecular dynamics approach. Its structural, electrical and mechanical features are reconnoitered in details and compared with those of turbostratic BC and some important graphite-like amorphous materials. Our computer-generated structure exhibits strong chemical disorder as seen in turbostratic BC. However, it has mixed sp(2) and sp(3) hybridizations and the average coordination number of B and C atoms is projected to be similar to 3.22 and 3.46, correspondingly. Consequently, a-BC appears to be structurally different from turbostratic BC and graphite-like amorphous systems. a-BC is semiconductor having a theoretical band gap of similar to 0.20 eV. The bulk, Young's and shear moduli are estimated as similar to 105, 142 and 56 GPa, respectively. Its Vickers hardness is calculated to be about 7-8.5 GPa. a-BC is anticipated to be electronically and mechanically parallel to amorphous boron carbonitride.

Source

JOURNAL OF MATERIALS SCIENCE

Volume

Volume: 55

Issue

30

URI

https://doi.org/10.1007/s10853-020-05012-8
https://hdl.handle.net/20.500.12573/504

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  • Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü Koleksiyonu [81]



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