Towards quantitative LEIS with alkali metal ions

Gainullin, I. K.

doi:10.1016/j.susc.2018.08.007

Cited by 20 publications

(3 citation statements)

References 99 publications

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“…Composition spread alloy films (CSAFs) are high-throughput libraries that were first developed in the 1950s for determination of alloy phase diagrams. 38 Since then, they have been successfully applied to study the phase diagrams, electronic structures, 39 and many other properties of multicomponent alloy systems. Figure 1 illustrates a ternary CSAF prepared by deposition of three alloy components with composition gradients oriented at 120°.…”

Section: ■ Introductionmentioning

confidence: 99%

“…High-throughput experimentation has greatly accelerated material exploration over the past decade. − High-throughput experimentation allows parallel production and characterization of numerous materials with different compositions or structures. Composition spread alloy films (CSAFs) are high-throughput libraries that were first developed in the 1950s for determination of alloy phase diagrams . Since then, they have been successfully applied to study the phase diagrams, electronic structures, and many other properties of multicomponent alloy systems.…”

Section: Introductionmentioning

confidence: 99%

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Surface Segregation Across Ternary Alloy Composition Space: Cu_xAu_yPd_1–x–y

2020

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Surface segregation is a phenomenon common to all multicomponent materials and one that plays a critical role in determining their surface properties. Comprehensive studies of surface segregation versus bulk composition in ternary alloys have been prohibitive because of the need to study many different compositions. In this work, high-throughput low-energy He+ ion-scattering spectra and energy-dispersive X-ray spectra were collected from a Cu x Au y Pd1–x–y composition spread alloy film under ultrahigh vacuum conditions. These have been used to quantify surface segregation across the entire Cu x Au y Pd1–x–y composition space (x = 0 → 1 and y = 0 → 1 – x). Surface compositions at 164 different bulk compositions were measured at 500 and 600 K. At both temperatures, Au shows the greatest tendency for segregation to the top-most surface while Pd is always depleted from the surface. Higher temperatures enhance the Au segregation. Segregation at most of the binary alloy bulk compositions matches with observations previously reported in the literature. However, surface compositions in the CuPd B2 composition region reveal segregation profiles that are nonmonotonic in bulk alloy composition. These were not observable in prior studies because of their limited resolution of composition space. An extended Langmuir–MacLean model, which describes ternary alloy segregation, has been used to analyze experimental data from the ternary alloys and to estimate pair-wise segregation free energies and segregation equilibrium constants. The ability to study surface segregation across the ternary alloy composition space with high-throughput methods has been validated, and the impact of bulk alloy phase on surface segregation is demonstrated and discussed.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Segregation Across Ternary Alloy Composition Space: Cu_xAu_yPd_1–x–y

2020

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“…Ultimate surface sensitivity results from the high neutralization probabilities of the commonly employed noble gas ions in an energy regime with primary energies E0 ≤ 5 keV. When single crystals are used as targets, ions scattered from deeper layers can be additionally suppressed due to shadowing and blocking effects, yielding even enhanced surface sensitivity for noble gas ions [8] and excellent sensitivity also for alkali projectiles [9,10].…”

Section: Introductionmentioning

confidence: 99%

Neutralization of slow helium ions scattered from single crystalline aluminum and tantalum surfaces and their oxides

2020

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We investigated the impact of surface oxygen on the ion yield for He + ions scattered from different single crystalline surfaces in low-energy ion scattering. Initially clean Al(111) and Ta(111) were exposed to molecular oxygen and ion spectra for different oxidation stages and different primary energies were recorded. A comparison of ion yields normalized to the differential scattering cross section as well as experimental factors allows obtaining information about the influence of oxygen on charge exchange processes. The decrease in the ion yield of both metals with exposure cannot be explained by different surface coverages exclusively, but requires the neutralization efficiency to be dependent on the chemical structure of the surface. For Ta, additionally, a different energy dependency of the ion yield obtained in the metal and oxide occurs. The ion yield for O shows in both surfaces a significantly weaker energy dependency than the investigated metals.

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A practical guide to interpreting low energy ion scattering (LEIS) spectra

Průša,

Linford,

Vaníčková

et al. 2024

Applied Surface Science

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Towards quantitative LEIS with alkali metal ions

Cited by 20 publications

References 99 publications

Surface Segregation Across Ternary Alloy Composition Space: Cu_xAu_yPd_1–x–y

Surface Segregation Across Ternary Alloy Composition Space: Cu_xAu_yPd_1–x–y

Neutralization of slow helium ions scattered from single crystalline aluminum and tantalum surfaces and their oxides

A practical guide to interpreting low energy ion scattering (LEIS) spectra

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Towards quantitative LEIS with alkali metal ions

Cited by 20 publications

References 99 publications

Surface Segregation Across Ternary Alloy Composition Space: CuxAuyPd1–x–y

Surface Segregation Across Ternary Alloy Composition Space: CuxAuyPd1–x–y

Neutralization of slow helium ions scattered from single crystalline aluminum and tantalum surfaces and their oxides

A practical guide to interpreting low energy ion scattering (LEIS) spectra

Contact Info

Product

Resources

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Surface Segregation Across Ternary Alloy Composition Space: Cu_xAu_yPd_1–x–y

Surface Segregation Across Ternary Alloy Composition Space: Cu_xAu_yPd_1–x–y