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
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
相关论文
共 29 条
  • [1] ABBOTT BS, 1990, AIP C P, V231, P344
  • [2] ALEXANDER MN, 1985, AIP C P, V140, P168
  • [3] THE NATURE OF THE CHEMICAL BONDING IN BORON-CARBIDE .4. ELECTRONIC BAND-STRUCTURE OF BORON-CARBIDE, B13C2, AND 3 MODELS OF THE STRUCTURE B12C3
    ARMSTRONG, DR
    BOLLAND, J
    PERKINS, PG
    WILL, G
    KIRFEL, A
    [J]. ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1983, 39 (JUN): : 324 - 329
  • [4] ASELAGE TL, 1990, AIP C P, V231, P97
  • [5] BRAY PJ, 1985, AIP C P, V140, P142
  • [6] BULLETT DW, PHYSICS CHEM CARBIDE, P513
  • [7] SELF-CONSISTENT CALCULATIONS OF THE ENERGY-BANDS AND BONDING PROPERTIES OF B-12(C-3)
    BYLANDER, DM
    KLEINMAN, L
    LEE, S
    [J]. PHYSICAL REVIEW B, 1990, 42 (02): : 1394 - 1403
  • [8] DUNCAN TM, 1985, AIP C P, V140, P177
  • [9] EMIN D, 1990, AIP C P, V231, P65
  • [10] FLORENCE MM, 1990, AIP C P, V231, P37