Linear AgO is grown along the 〈001〉 direction when a Ag(110) surface is exposed to O2 at room temperature. After exposure to 760 ℓ O2 the surface is a mixture of p(3×1)-O and (5×1)-O phases; the (5×1) domain is composed of an alternate arrangement of phases of (3×1) and (2×1) periodicity. At the boundary of the p(3×1) and (5×1) phases, the two phases can form a smooth junction but the real boundary has a fluctuating structure. When the p(2×1)-O/Ag(110) surface was heated to 500 K, the surface was changed to a p(4×1) structure composed of the four out-of-phase domains. The boundary of the out-of-phase p(4×1) domains takes either nine or ten atomic spacings, and the boundary adopts a fluctuating linear structure. We conclude that energetically degenerate sites inevitably appear when the two phases make contact, and this results in the fluctuation of the domain boundaries.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry