Cluster approach to formation of nitrogen–rare gas cryoalloys

Solodovnik, A. A.; Danchuk, V. V.; Mysko, N. S.

doi:10.1063/1.4807326

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…Up to 3.5 mol% Sc 2 O 3 content (see the grey region in Figure 4 ), the ScSZ films are characterized by the monoclinic (P121/c1) phase with an intense halo. Based on the regularity of the ScSZ sold alloy, at low concentrations, single scandium atoms (having neighbors in the first coordination sphere of only zirconium atoms) dominate ( Supplementary Materials Figure S6 ) by analogy with the cluster approach developed by the authors [ 57 , 58 , 59 ] for close-packed solids. This does not favor the formation of fcc phase regions.…”

Section: Resultsmentioning

confidence: 99%

Nanocrystalline Cubic Phase Scandium-Stabilized Zirconia Thin Films

Danchuk,

Shatalov,

Zinigrad

et al. 2024

Nanomaterials

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The cubic zirconia (ZrO2) is attractive for a broad range of applications. However, at room temperature, the cubic phase needs to be stabilized. The most studied stabilization method is the addition of the oxides of trivalent metals, such as Sc2O3. Another method is the stabilization of the cubic phase in nanostructures—nanopowders or nanocrystallites of pure zirconia. We studied the relationship between the size factor and the dopant concentration range for the formation and stabilization of the cubic phase in scandium-stabilized zirconia (ScSZ) films. The thin films of (ZrO2)1−x(Sc2O3)x, with x from 0 to 0.2, were deposited on room-temperature substrates by reactive direct current magnetron co-sputtering. The crystal structure of films with an average crystallite size of 85 Å was cubic at Sc2O3 content from 6.5 to 17.5 mol%, which is much broader than the range of 8–12 mol.% of the conventional deposition methods. The sputtering of ScSZ films on hot substrates resulted in a doubling of crystallite size and a decrease in the cubic phase range to 7.4–11 mol% of Sc2O3 content. This confirmed that the size of crystallites is one of the determining factors for expanding the concentration range for forming and stabilizing the cubic phase of ScSZ films.

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Section: Resultsmentioning

confidence: 99%

Nanocrystalline Cubic Phase Scandium-Stabilized Zirconia Thin Films

Danchuk,

Shatalov,

Zinigrad

et al. 2024

Nanomaterials

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“…Samples were prepared directly inside the working column by deposition gas mixtures of known composition onto a cooled substrate film [12]. The gases were mixed in a special bottle at room temperature, the typical mutual diffusion time according to the Einstein-Smoluchowski relations amounted to 21 s. Therefore, the typical waiting time of up to 5 minutes at room temperature ensured a uniform distribution of the gases.…”

Section: Methodsmentioning

confidence: 99%

Unusual morphology of equimolar Ar–Kr alloys

Danchuk

Solodovnik

Mysko

et al. 2015

Low Temperature Physics

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The transmission high electron energy diffraction (THEED) technique was employed for studying the structure of the equimolar Ar-Kr alloy, in which the thermodynamics predicts the maximum feasibility of phase separation. Deposition of preliminarily cooled gas mixtures was performed onto substrates cooled to 6 or 20 K. All diffraction patterns contained several sets of reflections against an appreciable background. Analysis of the data obtained during a warm-up from 6 to 33 K (at which the major part of argon was removed due to sublimation) as well as of the diffraction pattern from the "sandwich" (two successively deposited film of pure Ar and Kr) provided reliable arguments for the following conclusions. Actually, we have documented for the first time a phase separation of an Ar-Kr mixture, manifestations of which turned out to be oddly asymmetric as far as the behavior of the components involved is concerned. Upon deposition both onto 6 or 20 K the emerging sample contained two crystal phases of virtually pure argon with a small admixture of krypton. One of the Ar phases (fcc) did not cause a surprise, whereas the other was hcp with the a/c ratio close to the ideal value. The krypton component separated as a fine-grained glass-like state, possibly, with a low admixture of argon.

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Structure of N2-CH4 cryoalloys

Solodovnik

Mysko-Krutik

Bagatskii

2017

Low Temperature Physics

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Transmission electron diffraction is used to study the structure of N2-CH4 alloys over the entire range of mutual concentrations. Samples were prepared in situ by deposition of a gaseous mixture on aluminum and carbon substrates at temperatures of 19 and 5 K. The solubility limits for the components are less than 6% methane in crystalline nitrogen and 35% nitrogen in solid methane. The dependence of the lattice parameter on composition is studied in terms of a three-cluster model for low concentrations of the components in the solutions. The effect of impurity CH4 molecules on the orientational ordering of N2 molecules in the solutions is investigated.

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Cluster approach to formation of nitrogen–rare gas cryoalloys

Cited by 5 publications

References 6 publications

Nanocrystalline Cubic Phase Scandium-Stabilized Zirconia Thin Films

Nanocrystalline Cubic Phase Scandium-Stabilized Zirconia Thin Films

Unusual morphology of equimolar Ar–Kr alloys

Structure of N2-CH4 cryoalloys

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