A new superhard material:: Osmium diboride OsB2

被引：103
作者：
Hebbache, M. [1 ]
Stuparevic, L. [1 ]
Zivkovic, D. [1 ]
机构：
[1] Univ Paris 07, Dept Phys, Mat & Phenomenes Quant UMR 7162, F-75251 Paris 05, France
来源：
SOLID STATE COMMUNICATIONS | 2006年 / 139卷 / 05期
关键词：
superhard materials; osmium diboride; electronic properties; ab initio calculations;
D O I：
10.1016/j.ssc.2006.05.041
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Superhard materials have many industrial applications, wherever resistance to abrasion and wear are important. The synthesis of new superhard materials is one of the great challenges to scientists. We re-examined the phase diagram of the binary osmium-boron system and confirmed the existence of two hexagonal phases, OsB1.1, Os2B3, and an orthorhombic phase, OsB2. Almost nothing is known about the physical properties of osmium borides. Microhardness measurements show that OsB2 is extremely hard. Ab initio calculations show that this is due to formation of covalent bonds between boron atoms. OsB2 is also a low compressibility material. It can be used as hard coating. (c) 2006 Elsevier Ltd. All rights reserved.
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页码：227 / 231
页数：5
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