Formation of highly ordered Ca-overlayers on TiO2(110) surfaces studied byscanning tunneling microscopy and atomistic simulation

Authors
Norenberg, H Harding, JH
Citation
H. Norenberg et Jh. Harding, Formation of highly ordered Ca-overlayers on TiO2(110) surfaces studied byscanning tunneling microscopy and atomistic simulation, APPL SURF S, 142(1-4), 1999, pp. 174-176
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
APPLIED SURFACE SCIENCE
ISSN journal
01694332 → ACNP
Volume
142
Issue
1-4
Year of publication
1999
Pages
174 - 176
Database
ISI
SICI code
0169-4332(199904)142:1-4<174:FOHOCO>2.0.ZU;2-W
Abstract
An ordered surface layer of Ca on TiO2(110) has been prepared and studied a fter annealing of a TiO2-rutile crystal, During the annealing process Ca im purities from the bulk segregate to the surface. A well ordered p(3 x 1) re construction has been observed by scanning tunneling microscopy (STM). Calc ulations have shown that the p(3 x 1) reconstruction has the lowest energy. Every third Ca ion in the [001] direction is elevated by around 1 Angstrom . Therefore, the STM contrast is mainly due to calcium and caused by geomet ry rather than electronic effects. (C) 1999 Elsevier Science B.V. All right s reserved.