PRESTAGES AND INITIAL-STAGES OF EPITAXY IN ALKALI-HALIDE SYSTEMS .1. INTERACTION OF MOLECULAR-BEAMS OF KCL WITH (100) SURFACES OF NACL

被引:22
作者
DABRINGHAUS, H
HAAG, M
机构
[1] Mineralogisch-Petrologisches Institut der Universität Bonn Poppelsdorfer Schloss
关键词
D O I
10.1016/0039-6028(92)90975-C
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
The interaction of molecular beams of KCl with (100) surfaces of NaCl is studied by mass spectrometry of transient and steady state desorption fluxes and by static SIMS, LEED, and the electron microscopic decoration technique. The results for undersaturation are interpreted by an interplay of condensation, bulk diffusion and re-evaporation of KCl molecules and K+ ions, respectively. From the time constants of the transients the bulk diffusion coefficient of K+ in NaCl D = 35(+32/-17) exp[-(2.04 +/- 0.04) eV/kT] cm2 s-1 with a corresponding jump energy E(m) = 0.98 eV is obtained. The results for supersaturation are interpreted by the formation of a solid-solution layer growing on the surface with a surface composition changing continuously from pure NaCl to nearly pure KCl with increasing thickness. Different activity coefficients of KCl and NaCl for this mixed-crystal layer are interpreted kinetically, i.e., by the different bulk diffusion coefficients of Na+ and K+ ions.
引用
收藏
页码:351 / 364
页数:14
相关论文
共 27 条
[1]  
ARAI G, 1966, PHYS REV, V143, P663
[2]  
BASSETT GA, 1958, PHILOS MAG, V3, P427
[3]  
Bauer E, 1958, Z KRISTALLOGR, V110, P395, DOI DOI 10.1524/ZKRI.1958.110.1-6.395
[4]  
Bauer E., 1958, Z KRISTALLOGR, V110, P372, DOI DOI 10.1524/ZKRI.1958.110.1-6.372
[5]  
BAUER E, 1956, Z KRISTALLOGR, V107, P72
[6]   SURFACE INVESTIGATION OF SOLIDS BY STATICAL METHOD OF SECONDARY ION MASS SPECTROSCOPY (SIMS) [J].
BENNINGHOVEN, A .
SURFACE SCIENCE, 1973, 35 (01) :427-457
[7]   RATES OF EVAPORATION .6. THE VAPOUR PRESSURE AND RATE OF EVAPORATION OF POTASSIUM CHLORIDE [J].
BRADLEY, RS ;
VOLANS, P .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1953, 217 (1131) :508-523
[9]   INVESTIGATION OF CONDENSATION AND EVAPORATION OF ALKALI-HALIDE CRYSTALS BY MOLECULAR-BEAM METHODS .9. MEASUREMENTS WITH STATIC MOLECULAR-BEAMS ON THE (100) SURFACE OF LIF [J].
DABRINGHAUS, H ;
MEYER, HJ .
JOURNAL OF CRYSTAL GROWTH, 1983, 61 (01) :91-94
[10]   INTERACTION OF MOLECULAR-BEAMS OF RBCL WITH (100) SURFACES OF NACL [J].
DABRINGHAUS, H ;
MEYER, HJ .
SURFACE SCIENCE, 1989, 218 (2-3) :519-542