Competing Reconstruction Mechanisms in H/Ni(110)

Behm, R. J.; Christmann, K.; Ertl, C.; Penka, V.; Schwankner, R.

doi:10.1007/978-3-642-82493-7_41

The Structure of Surfaces

1985

DOI: 10.1007/978-3-642-82493-7_41

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Competing Reconstruction Mechanisms in H/Ni(110)

R. J. Behm¹,

K. Christmann²,

C. Ertl³

et al.

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1985

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Cited by 3 publications

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“…The existence of various hydrated Cu borates has been reported (Behm, 1982), but so far only two structures of hydrated Cu borates have been determined: that of the mineral bandylite by Collin (1951) and Fornaseri (1950Fornaseri ( , 1951 and that of Na6[Cu2{B16024(OH)10}].12H20 by Behm (1983). A summary of the literature has been given previously (Behm, 1982). The new Cu borate with formula Cu2{BO(OH)E}(OH) 3 was obtained in the course of a futile attempt to synthesize bandylite, CuB(OH)4C1.…”

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confidence: 99%

X-ray Rietveld structure determination of trihydroxo[dihydroxo(oxo)borato]dicopper(II), [Cu2{BO(OH)2}(OH)3]

Behm¹,

Baerlocher²

1985

Acta Crystallogr C

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X-ray Rietveld structure determination of trihydroxo[dihydroxo(oxo)borato]dicopper(II), [Cu2{BO(OH)2}(OH)3]

Behm¹,

Baerlocher²

1985

Acta Crystallogr C

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“…At T< 180 K the adsorbed H atoms form a series of ordered lattice gas structures, which are completed with a (2 • 1) phase at 0 = 1.0 [2,3]. Above this coverage Ha0 induces a reconstruction of the surface into domains of a (1 • 2) structure [4] which covers the entire surface at a saturation coverage of disordered phase starts already at rather low coverages [6]; it equally exhibits a (1 • 2) pattern.…”

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A leed analysis of the (2 × 1)H-Ni(110) structure

Reimer¹,

Penka²,

Skottke³

et al. 1987

Surface Science Letters

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A monolayer of H atoms adsorbed on Ni(ll0) below 180 K forms a (2 • 1) structure. The unit cell exhibits a glide symmetry plane and contains two adsorbed atoms. Based on a quantitative comparison between experimental and calculated LEED I/V spectra using standard R-factors the following structure was derived: On the clean Ni(ll0) surface the separation between the first two atomic layers, da2, is contracted by 8.5% + 1.5% with respect to the bulk value; those between the second and third and the third and fourth layer, d23 and d34, are expanded by 3.5% + 1.5% and 1% + 1.5%, respectively -in agreement with recent other resutls. In the presence of the H adlayer the contraction of da2 is reduced to 4.5% :i:1.5%, while the expansion of d23 is not affected within the limits of accuracy. The third interlayer spacing d34 returns to its bulk value. The H atoms occupy threefold-coordinated sites formed by two Ni atoms from the first layer and one Ni atom from the second layer which confirms previous more qualitative conclusions based on He diffraction and vibrational spectroscopy. The bond lengths between H and its neighbouring Ni atoms were determined to be equal, namely 1.72+0.1 ,~.The structure of adsorbate layers is of particular interest for the understanding of the energetics of the adsorption system; for the substrate-adsorbate interaction determining the local adsorption geometry as well as for the adsorbate-adsorbate interactions which govern the lateral distribution of the adparticles. Under these aspects the system H/Ni(ll0)[1] appears extremely promising because of its large number of ordered structures. At T< 180 K the adsorbed H atoms form a series of ordered lattice gas structures, which are completed with a (2 • 1) phase at 0 = 1.0 [2,3]. Above this coverage Ha0 induces a reconstruction of the surface into domains of a (1 • 2) structure [4] which covers the entire surface at a saturation coverage of * Present address: Fritz-Haber

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Reconstructive adsorption of HRh(110)—a multiphase study

Nichtl-Pecher

Oed

Landskron

et al. 1990

Vacuum

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Competing Reconstruction Mechanisms in H/Ni(110)

Cited by 3 publications

References 13 publications

X-ray Rietveld structure determination of trihydroxo[dihydroxo(oxo)borato]dicopper(II), [Cu2{BO(OH)2}(OH)3]

X-ray Rietveld structure determination of trihydroxo[dihydroxo(oxo)borato]dicopper(II), [Cu2{BO(OH)2}(OH)3]

A leed analysis of the (2 × 1)H-Ni(110) structure

Reconstructive adsorption of HRh(110)—a multiphase study

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