Surface composition of Pt-Rh alloys : the role of lattice vibrational entropy

Dick van Langeveld; J.W. Niemantsverdriet

doi:10.1016/0039-6028(86)90364-X

Surface composition of Pt-Rh alloys : the role of lattice vibrational entropy

Dick van Langeveld, J.W. Niemantsverdriet

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Abstract

The bulk and surface composition of a polycrystalline Pt-Rh alloy, equilibrated at 1000 K., have been analysed by use of Auger electron spectroscopy. The results are discussed in relation to experimental data in the literature. Although the enthalpy of sublimation and the atomic diameters of Pt and Rh do not differ very much, a significant enrichment of Pt in the surface is observed. It is shown that the surface segregation behaviour in atomically clean Pt-Rh alloys can be understood quantitatively by taking into account the difference in vibrational entropy of bulk and surface atoms of the constituent metals

Original language	English
Pages (from-to)	880-887
Journal	Surface Science
Volume	178
Issue number	1-3
DOIs	https://doi.org/10.1016/0039-6028(86)90364-X
Publication status	Published - 1986

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title = "Surface composition of Pt-Rh alloys : the role of lattice vibrational entropy",

abstract = "The bulk and surface composition of a polycrystalline Pt-Rh alloy, equilibrated at 1000 K., have been analysed by use of Auger electron spectroscopy. The results are discussed in relation to experimental data in the literature. Although the enthalpy of sublimation and the atomic diameters of Pt and Rh do not differ very much, a significant enrichment of Pt in the surface is observed. It is shown that the surface segregation behaviour in atomically clean Pt-Rh alloys can be understood quantitatively by taking into account the difference in vibrational entropy of bulk and surface atoms of the constituent metals",

author = "{van Langeveld}, Dick and J.W. Niemantsverdriet",

year = "1986",

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T1 - Surface composition of Pt-Rh alloys : the role of lattice vibrational entropy

AU - van Langeveld, Dick

AU - Niemantsverdriet, J.W.

PY - 1986

Y1 - 1986

N2 - The bulk and surface composition of a polycrystalline Pt-Rh alloy, equilibrated at 1000 K., have been analysed by use of Auger electron spectroscopy. The results are discussed in relation to experimental data in the literature. Although the enthalpy of sublimation and the atomic diameters of Pt and Rh do not differ very much, a significant enrichment of Pt in the surface is observed. It is shown that the surface segregation behaviour in atomically clean Pt-Rh alloys can be understood quantitatively by taking into account the difference in vibrational entropy of bulk and surface atoms of the constituent metals

AB - The bulk and surface composition of a polycrystalline Pt-Rh alloy, equilibrated at 1000 K., have been analysed by use of Auger electron spectroscopy. The results are discussed in relation to experimental data in the literature. Although the enthalpy of sublimation and the atomic diameters of Pt and Rh do not differ very much, a significant enrichment of Pt in the surface is observed. It is shown that the surface segregation behaviour in atomically clean Pt-Rh alloys can be understood quantitatively by taking into account the difference in vibrational entropy of bulk and surface atoms of the constituent metals

U2 - 10.1016/0039-6028(86)90364-X

DO - 10.1016/0039-6028(86)90364-X

M3 - Article

SN - 0039-6028

VL - 178

SP - 880

EP - 887

JO - Surface Science

JF - Surface Science

IS - 1-3

ER -

Surface composition of Pt-Rh alloys : the role of lattice vibrational entropy

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