Type of surface phases

Concentrations of A (Cr)

Thickness

of phase,

d, Å

Composition

of phase,

AXBY

Substrate

Phase

Si(111)-1´1-Cr (s-alloy)

0

0.10

3.9

CrSi9

Si(111)-a()R30˚-Cr

0

0.28

3.3

CrSi3

Si(111)-b()R30˚-Cr

0

0.40

7.1

Cr2Si3

CrSi2(0001)-1 ´ 1-Si

0.33

0.03

1.25

Si