Sequential Ta(100) carbonisation: from adsorption of single carbon atoms to bulk carbide production

被引：13

作者：

Gall, NR ^{[1
]}

Rut'kov, EV ^{[1
]}

Tontegode, AY ^{[1
]}

机构：

[1] Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia

来源：

SURFACE SCIENCE | 2001年 / 472卷 / 03期

关键词：

Auger electron spectroscopy; diffusion and migration; surface thermodynamics (including phase transitions); carbon; tantalum; polycrystalline surfaces; metallic surfaces;

D O I：

10.1016/S0039-6028(00)00933-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sequential stages of Ta carbonisation from the initial atomic adsorption to bulk carbide (BC) production throughout the sample have been studied by high temperature high resolution Auger spectroscopy in ultra-high vacuum. Two compounds - surface carbide (SC) Ta5C2 and BC TaC - were found. The energy barrier heights for atomic carbon transport from the surface to the bulk were estimated to be E-st = 2.1-2.3 eV and back E-ls = E-sl - DeltaE approximate to (1.2-1.6) eV and the activation energy of carbon bulk diffusion in Ta E-dif similar to 1.3 eV was refound. It is shown that SC can be treated as a thermodynamically 'legal' phase and should find its place in the equilibrium phase diagram. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：187 / 194

页数：8

共 28 条

[1] CARBON-MONOXIDE AND CARBON-DIOXIDE INTERACTION WITH TANTALUM [J].

BELOV, VD ;

USTINOV, YK ;

KOMAR, AP .

SURFACE SCIENCE, 1978, 72 (02) :390-404

[2] CHEMISORPTION ON TA(100) [J].

CHESTERS, MA ;

HOPKINS, BJ ;

LEGGETT, MR .

SURFACE SCIENCE, 1974, 43 (01) :1-10

[3]

Defay R., 1966, SURFACE TENSION ADSO

[4] CARBON AUGER-SPECTRA - TANTALUM CARBIDES AND ETHYLENE AND CARBON-MONOXIDE ADSORPTIONS ON POLYCRYSTALLINE RHENIUM AND POLYCRYSTALLINE TANTALUM [J].

DUCROS, R ;

PIQUARD, G ;

WEBER, B ;

CASSUTO, A .

SURFACE SCIENCE, 1976, 54 (02) :513-518

[5]

FOMENKO VS, 1981, EMISSIONAL PROPERTIE

[6] THERMODYNAMIC CALCULATIONS IN ALPHA-SOLID SOLUTION AREA OF SYSTEMS NB-C NB-N NB-O NB-C-O TA-C TA-N TA-O AND TA-C-O [J].

FROMM, E .

JOURNAL OF THE LESS-COMMON METALS, 1968, 14 (01) :113-&

[7]

FROMM E, 1976, GASE KOHLESTOFF META

[8] CARBON INTERACTION WITH THE RHENIUM SURFACE [J].

GALL, NR ;

MIKHAILOV, SN ;

RUTKOV, EV ;

TONTEGODE, AY .

SURFACE SCIENCE, 1987, 191 (1-2) :185-202

[9]

Gall NR, 1998, IZV AKAD NAUK FIZ+, V62, P1980

[10]

GALL NR, 1997, J CHEM VAPOR DEPOS, V5, P72

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