Faceting phase transitions of Mo(111) induced by Pd, Au and oxygen overlayers

Song, Kyungchul; Lin, Jung-Charng; Lai, Ming Yang; Wang, Yuh‐Lin

doi:10.1016/0039-6028(94)00822-1

Cited by 62 publications

(25 citation statements)

References 31 publications

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“…We observe also that the surface energy rapidly increases at T d and the heat capacity attains its maximum. A similar defaceting transition was obtained in simulations of faceting of a bcc(1 1 1) surface [27] and observed in LEED experiments [3] for Pd on Mo(1 1 1). The reverse process of slow cooling down the system from the highest temperature, leads again to faceting at the temperature T d .…”

Section: Faceting Of Curved Surfacessupporting

confidence: 71%

“…Formation of facets after a rapid cooling of disordered surface can be explained by a fast massive atomic rearrangement. Such effect has been observed in a Pd/Mo(1 1 1) system [3] in which 3-sided pyramidal facets occur on the bcc(1 1 1) surface after annealing to higher temperatures. Above T d % 870 K the pyramids disappear and surface becomes flat.…”

Section: Discussionmentioning

confidence: 87%

“…Moreover, the model describes a reversible phase transition from a faceted surface to a disordered (1 1 1) surface. Such a phase transition has been found in the Pd/Mo(1 1 1) system [3]. In this paper, we study faceting of a curved bcc crystal surface by using the SOS model.…”

Section: Introductionmentioning

confidence: 97%

“…Atomically rough W(1 1 1) and Mo(1 1 1) surfaces, when covered by a single physical monolayer of certain metals (Pd, Rh, Ir, Pt, Au) and annealed to T > 700 K, undergo massive reconstruction from a planar morphology to a microscopically faceted surface [1][2][3][4][5][6][7]. In most of investigated bcc(1 1 1) surfaces, the faceted morphology comprises 3-sided pyramids with {2 1 1} facets and facet sizes ranging from $3 to 100 nm.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Simulation of adsorbate-induced faceting on curved surfaces

Niewieczerzal

Oleksy

2006

Surface Science

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A simple solid-on-solid model, proposed earlier to describe overlayer-induced faceting of bcc(111) surface, is applied to faceting of spherical surfaces covered by adsorbate monolayer. Monte Carlo simulation results show that morphology of faceted surface depends on annealing temperature. At initial stage surface around the [111] pole consists of 3-sided pyramids and step-like facets, then step-like facets dominate and their number decreases with temperature, finally a single big pyramid is formed. It is shown that there is reversible phase transition at which faceted surface transforms to almost spherical one. It is found that temperature of this phase transition is an increasing function of surface curvature. Simulation results show that measurements of high temperature properties performed directly and after fast cooling to low temperature lead to different results.Comment: 8 pages, 10 figure

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Section: Faceting Of Curved Surfacessupporting

confidence: 71%

Section: Discussionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of adsorbate-induced faceting on curved surfaces

Niewieczerzal

Oleksy

2006

Surface Science

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“…[42] Other impurities and additives also induce surface faceting in certain metals. [43,44,45] The grain boundary faceting is induced by O in Ni, [20] by Bi in Cu, [21] and by Te in Fe.…”

Section: Methodsmentioning

confidence: 99%

The dependence of normal and abnormal grain growth in silver on annealing temperature and atmosphere

Koo

Yoon

2001

Metall Mater Trans A

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When polycrystalline pure Ag specimens are compressed to 40 pct and annealed, there is no noticeable texture in the recrystallized structure, and normal or abnormal grain growth occurs during annealing. When annealed further in low vacuum (10 Ϫ3 to 10 Ϫ4 Torr) after the completion of recrystallization, normal grain growth occurs at 920 ЊC and 800 ЊC, but abnormal grain growth (AGG) occurs at 700 ЊC, 600 ЊC, and 500 ЊC. When annealed in O 2 atmosphere, normal grain growth occurs at 920 ЊC and AGG at 800 ЊC, 700 ЊC, 600 ЊC, and 500 ЊC. At temperatures close to the melting point (960.5 ЊC), the grain boundaries are expected to be rough at atomic scales and hence have nearly isotropic boundary energy. The normal growth of the grains with such atomically rough boundary structures is consistent with some theoretical analysis and simulation. At low temperatures, the grain boundaries can be faceted with probably singular structures. Because these grain boundaries apparently migrate by the movement of boundary steps, AGG occurs. The observations with optical microscopy indeed indicate that some grain boundaries are faceted at low temperatures and all of them are smoothly curved indicating an atomically rough structure at high temperatures close to the melting point. Although the results are not conclusive, they support the hypothesis that AGG occurs because the faceted singular grain boundaries migrate by the step mechanism.

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The Growth and Stability of Ultrathin Films on Metal and Oxide Surfaces

Madey

1997

Chemisorption and Reactivity on Supported Clusters and Thin Films

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Faceting phase transitions of Mo(111) induced by Pd, Au and oxygen overlayers

Cited by 62 publications

References 31 publications

Simulation of adsorbate-induced faceting on curved surfaces

Simulation of adsorbate-induced faceting on curved surfaces

The dependence of normal and abnormal grain growth in silver on annealing temperature and atmosphere

The Growth and Stability of Ultrathin Films on Metal and Oxide Surfaces

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