Interactions of surface states of copper with transition metals and cesium

Chudinov, D. V.; Kulkova, S. E.; Smolin, I. Yu.

doi:10.1134/1.1562252

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…Using the temperature-dependent ultrasonic studies by Chudinov, C 11 ( T ) can be obtained from the sound velocity tensor. The measurements are limited to the temperature range 80−640 K, but extrapolation can be justified since the sound velocities vary linearly with temperature up to 640 K . Ravich et al listed a room temperature deformation potential of ∼20 eV.…”

Section: Resultsmentioning

confidence: 99%

Nanostructures Boost the Thermoelectric Performance of PbS

et al. 2011

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In situ nanostructuring in bulk thermoelectric materials through thermo-dynamic phase segregation has established itself as an effective paradigm for optimizing the performance of thermoelectric materials. In bulk PbTe small compositional variations create coherent and semicoherent nanometer sized precipitates embedded in a PbTe matrix, where they can impede phonon propagation at little or no expense to the electronic properties. In this paper the nanostructuring paradigm is for the first time extended to a bulk PbS based system, which despite obvious advantages of price and abundancy, so far has been largely disregarded in thermoelectric research due to inferior room temperature thermoelectric properties relative to the pristine fellow chalcogenides, PbSe and PbTe. Herein we report on the synthesis, microstructural morphology and thermoelectric properties of two phase (PbS)(1-x)(PbTe)(x)x = 0-0.16 samples. We have found that the addition of only a few percent PbTe to PbS results in a highly nanostructured material, where PbTe precipitates are coherently and semicoherently embedded in a PbS matrix. The present (PbS)(1-x)(PbTe)(x) nanostructured samples show substantial decreases in lattice thermal conductivity relative to pristine PbS, while the electronic properties are left largely unaltered. This in turn leads to a marked increase in the thermoelectric figure of merit. This study underlines the efficiency of the nanostructuring approach and strongly supports its generality and applicability to other material systems. We demonstrate that these PbS-based materials, which are made primarily from abundant Pb and S, outperform optimally n-type doped pristine PbTe above 770 K.

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Section: Resultsmentioning

confidence: 99%

Nanostructures Boost the Thermoelectric Performance of PbS

et al. 2011

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“…Concerning Cs adsorption on Cu metal surfaces, the recently published articles 45,46,47,48,49,50 mainly focus on the investigation of electronic, dynamic, and geometry properties of Cs layers on Cu(111). The nature of interaction between the Cs adatom and Cu(001) film has been studied both via first-principles pseudopotential calculations 51 or through and a jellium model approach 52 .…”

Section: Introductionmentioning

confidence: 99%

First-principles calculations of Cs adsorbed on Cu(001): Quantum size effect in surface energetics and surface chemical reactivities

et al. 2007

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First-principles calculations of Cu(001) free-standing thin films have been performed to investigate the oscillatory quantum size effects exhibited in surface energy, work function, atomic relaxation, and adsorption energy of the cesium adsorbate. The quantum well states have been shown and clarified at particular k-points corresponding to the stationary extrema in bulk Brillouin zone, which are in good agreement with experimental observations. The calculated surface energetics and geometry relaxations are clearly featured by quantum oscillations as a function of the film thickness of the film with oscillation periods characterized by a superposition of long and short length scales. Furthermore, we have investigated Cs adsorption onto Cu(001) thin films as a function of the film thickness. Our systematic calculated results clearly show the large-amplitude quantum oscillations in adsorption energetics, which may be used to tailor catalysis, chemical reactions and other surface processes in nanostructured materials.

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