EVOLUTION OF THE STRUCTURE OF ULTRAFINE SIC-LASER-FORMED POWDERS WITH SYNTHESIS CONDITIONS

被引：24

作者：

TOUGNE, P ^{[1
]}

HOMMEL, H ^{[1
]}

LEGRAND, AP ^{[1
]}

HERLIN, N ^{[1
]}

LUCE, M ^{[1
]}

CAUCHETIER, M ^{[1
]}

机构：

[1] CENS,CEA,SERV PHOTONS ATOMES & MOLEC,F-91191 GIF SUR YVETTE,FRANCE

来源：

关键词：

D O I：

10.1016/0925-9635(93)90105-B

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ultrafine SiC powders in the nanometre range (less than 100 nm) have been synthesized by laser-driven reactions. Mixtures of SiH4 and C2H2 (eventually with He) have been irradiated by a high power continuous-wave CO2 laser in a cross-flow configuration cell. By varying the reaction conditions (mainly flow rates of the reaction gases) amorphous to crystalline powders of various sizes were formed. The powders were investigated by Si-29 Solid state nuclear magnetic resonance. This technique, contrary to X-ray diffraction, is mainly sensitive to the local order of small regions of the materials. A comparison of the different spectra obtained provides information on the phase composition, alpha-SiC or beta-SiC of the materials, which seems different for these small powders from what is usually observed.

引用

页码：486 / 490

页数：5