Spontaneous L1(2) order at Ni90Al10(110) surfaces: An X-ray and first-principles-calculation study - art. no. 236102

Authors
Drautz, R Reichert, H Fahnle, M Dosch, H Sanchez, JM
Citation
R. Drautz et al., Spontaneous L1(2) order at Ni90Al10(110) surfaces: An X-ray and first-principles-calculation study - art. no. 236102, PHYS REV L, 8723(23), 2001, pp. 6102
Citations number
18
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
8723
Issue
23
Year of publication
2001
Database
ISI
SICI code
0031-9007(200112)8723:23<6102:SLOANS>2.0.ZU;2-K
Abstract
We have combined x-ray diffraction studies with first-principles calculatio ns to study the interplay between segregation and ordering at the (110) sur face of Ni90Al10. We find a L1(2)-ordered monolayer at the surface. The obs erved ordering as well as recently reported Al segregation at the surface a re explained in a consistent picture. A delicate competition between the te ndency for Al segregation and ordering in the Ni-Al system induced by the s ymmetry break at the surface stabilizes a long-range ordered surface in the entire concentration range c(Ni) > 0.75,