Laser-induced plasma reactions of transition metals with hydrocarbon: From clusters to microcrystals

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · High Temperature and Materials Science

OSTI ID:218634

Yu, H; Froben, F W ^[1]

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1. Free Univ., Berlin (Germany). Dept. of Physics

Laser vaporization of transition metals (Ti, V, Nb, Ta, Mo, and W) and reactions with small hydrocarbons (CH{sub 4} and C{sub 2}H{sub 4}) were observed with a TOF mass spectrometer. The measured results of V-C and Ti-C clusters indicate that met-cars and some clusters with atom ratios of 1:2 (metal to carbon) coexist in the product, and met-cars with one or two enclosed carbon atoms in the cages can be assumed for the nearly as intense satellite lines (M{sub 8}C{sub 13} and M{sub 8}C{sub 14}). The typical magic numbers for TaC and NbC microcrystals with rocksalt-like fcc structure were measured. Carbon atoms adsorbed on TaC and NbC microcrystals show different features. There is some interaction among the adsorbed carbon atoms. In the mass spectrum of NbC clusters, met-cars with single- and double-cage structures were identified. No significant magic numbers were observed for MoC and WC clusters. The ratio of metals to carbon atoms is 1:1 for Mo and 2:1 for W.

• OSTI ID: 218634
• Report Number(s): CONF-940468--
• Journal Information: High Temperature and Materials Science, Journal Name: High Temperature and Materials Science Journal Issue: 1-3 Vol. 34; ISSN 1080-1278; ISSN HTMSFP
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
ETHYLENE
EVAPORATION
FABRICATION
LASER-RADIATION HEATING
METHANE
MOLYBDENUM CARBIDES
NIOBIUM CARBIDES
TANTALUM CARBIDES
TIME-OF-FLIGHT MASS SPECTROMETERS
TITANIUM CARBIDES
TUNGSTEN CARBIDES
VANADIUM CARBIDES