ON THE MICROSTRUCTURE OF BORON-CARBIDE

被引：48
作者：
KUHLMANN, U
WERHEIT, H
机构：
[1] Solid State Physics Laboratory, University of Duisburg, D 4100 Duisburg 1
来源：
SOLID STATE COMMUNICATIONS | 1992年 / 83卷 / 11期
关键词：
D O I：
10.1016/0038-1098(92)90898-J
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The isotope distribution in natural and isotope enriched boron and in natural carbon makes different micro-compositions of the structure elements in boron carbide distinguishable by their lattice vibrations. The phonon band of the stretching mode of the central atom yields the C-B-C and C-B-B chain concentrations. Based on the chemical analysis the portions Of B-12 and B11C icosahedra were derived, too. The structure is not uniform at any composition. B4.3C is most homogeneus but contains 19 % C-B-B besides of 81 % C-B-C chains. The minimum content of B11C icosahedra (60 %) is at B6.5C. The force constant in the chains at B4.3C is 5.6 mdyne A-1. Present structure conceptions are largely disproved; related models of physical properties must be revised.
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页码：849 / 852
页数：4
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