Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 33, Issue -, Pages 93-106Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2012.02.021
Keywords
Hardness; Superhard materials; Modeling; Chemical bond; Crystal design
Funding
- NSFC [51121061, 91022029]
- NBRPC [2011CB808205]
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Hardness can be defined microscopically as the combined resistance of chemical bonds in a material to indentation. The current review presents three most popular microscopic models based on distinct scaling schemes of this resistance, namely the bond resistance, bond strength, and electronegativity models, with key points during employing these microscopic models addressed. These models can be used to estimate the hardness of known crystals. More importantly, hardness prediction based on the designed crystal structures becomes feasible with these models. Consequently, a straightforward and powerful criterion for novel superhard materials is provided. The current focuses of research on potential superhard materials are also discussed. (C) 2012 Elsevier Ltd. All rights reserved.
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