STRUCTURE AND PROPERTIES MODIFICATIONS IN BORON NITRIDE. PART I: DIRECT POLYMORPHIC TRANSFORMATIONS MECHANISMS

被引：0
|
作者：
Petrescu, M., I [1 ]
Balint, Madalina-Gabriela [2 ]
机构：
[1] Univ Politehn Bucuresti, Dept Engn & Management Elaborat Metall Mat, Bucharest, Romania
[2] RAMI Dacia Synthet Diamond Factory, Bucharest, Romania
来源：
UNIVERSITY POLITEHNICA OF BUCHAREST SCIENTIFIC BULLETIN SERIES B-CHEMISTRY AND MATERIALS SCIENCE | 2007年 / 69卷 / 01期
关键词：
hBN; rBN; turbostratic BN; cBN; wBN structure; polymorphic transitions; puckering and buckling mechanisms;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A thorough examination of the structure of boron nitride (BN) polymorphs and of the polymorphic transition mechanisms from sp(2) hybridized structures to sp(3) hybridized structures has been undertaken in view of explaining on quantitative bases the dramatic modification in hardness that makes hexagonal boron nitride (white graphite) a soft solid lubricant and cubic boron nitride (borazone) a superabrasive, second in hardness after diamond. Having in view this goal we have taken into consideration only the direct polymorphic transformations of BN that do not involve the participation of catalyst-solvent substances in the synthesis of sp(3) bonded polymorphs.
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页码：35 / 42
页数：8
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