Bibliografie tematiche / Oxide quasicrystal approximants

Letteratura scientifica selezionata sul tema "Oxide quasicrystal approximants"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Oxide quasicrystal approximants":

Huran, Ahmad W., Hai-Chen Wang e Miguel A. L. Marques. "Two-dimensional binary metal-oxide quasicrystal approximants". 2D Materials 8, n. 4 (7 luglio 2021): 045002. http://dx.doi.org/10.1088/2053-1583/ac0c03.

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Dorini, Thiago Trevizam, Florian Brix, Corentin Chatelier, Anton Kokalj e Émilie Gaudry. "Two-dimensional oxide quasicrystal approximants with tunable electronic and magnetic properties". Nanoscale 13, n. 24 (2021): 10771–79. http://dx.doi.org/10.1039/d1nr02407h.

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Yamada, Tsunetomo. "A four-dimensional model for the Ba–Ti–O dodecagonal quasicrystal". Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 78, n. 2 (24 marzo 2022): 247–52. http://dx.doi.org/10.1107/s205252062200227x.

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A four-dimensional (4D) model is presented of the first oxide dodecagonal quasicrystal found in a Ba–Ti–O ultra-thin film on a Pt(111) single-crystal substrate. The 4D model, with a 4D dodecagonal lattice constant a d = 8.39 Å, was derived by considering a tile decoration model of dodecagonal Niizeki–Gähler tiling composed of squares, triangles and 30° rhombuses. The model consists of four kinds of occupation domain, and 4D positional vectors defining the shape of each occupation domain are given. Moreover, the atomic arrangement of two Ba–Ti–O periodic approximants, the sigma-phase approximant and a 25.6 Å approximant were derived from the 4D model by the introduction of linear phason strains.

Ruano Merchan, C., T. T. Dorini, F. Brix, L. Pasquier, M. Jullien, D. Pierre, S. Andrieu et al. "Two-dimensional square and hexagonal oxide quasicrystal approximants in SrTiO₃ films grown on Pt(111)/Al₂O₃(0001)". Physical Chemistry Chemical Physics 24, n. 12 (2022): 7253–63. http://dx.doi.org/10.1039/d1cp05296a.

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An all-thin-film approach allows the synthesis of novel two-dimensional quasicrystalline approximants and an atomic scale description is provided based on combined experimental and theoretical investigations.

Förster, Stefan, Sebastian Schenk, Eva Maria Zollner, Oliver Krahn, Cheng-Tien Chiang, Florian O. Schumann, Alireza Bayat et al. "Quasicrystals and their Approximants in 2D Ternary Oxides". physica status solidi (b) 257, n. 7 (11 dicembre 2019): 1900624. http://dx.doi.org/10.1002/pssb.201900624.

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Kang, Song-Seng, e Jean-Marie Dubois. "Influence of the annealing atmosphere on the formation of Al–Cu–Fe quasicrystals". Journal of Materials Research 10, n. 5 (maggio 1995): 1071–74. http://dx.doi.org/10.1557/jmr.1995.1071.

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Icosahedral samples of nominal composition Al63.5Cu24Fe12.5, which normally grow a rhombohedral approximant crystal, were submitted to heat treatments of various durations. The atmosphere in contact with the surface of the specimens was either dry air or secondary vacuum in order to test whether the formation of the icosahedral phase is sensitive or not to the nature of the atmosphere. Materials annealed in air showed a very thin surface layer of oxide which contained hydrogen. Beneath this oxide layer, small quantities of oxygen and hydrogen were also detected within the underlying lattice. This contamination was sufficient to shift the composition of the samples out of the stability domain of the icosahedral phase and has induced formation of a significant amount of the cubic phase. In contrast, the rhombohedral compound no longer appeared. This behavior goes along with the great sensitivity of the icosahedral phase stability to a sharply denfined electron to atom ratio.

Demange, V., J. Ghanbaja, C. Beeli, F. Machizaud e J. M. Dubois. "Study of decagonal approximant and γ-brass-type compounds in Al–Cr–Fe thin films". Journal of Materials Research 19, n. 8 (agosto 2004): 2285–97. http://dx.doi.org/10.1557/jmr.2004.0311.

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This paper reports the preparation conditions and structure characteristics of Al–Cr–Fe very thin films (10–30 nm) obtained by the flash evaporation technique. The films are either amorphous or crystallized, depending on the thickness of the sample and temperature of the substrate. Annealing of amorphous films leads to crystallization of intermetallic phases that are all linked with quasicrystals. In particular, we have identified by transmission electron microscopy the following structures: body-centered-cubic (bcc) γ-brass phase, monoclinic λ–Al13(Cr,Fe)4 phase, and orthorhombic O1-phase, all of them already observed in this system, together with four new structures, i.e., a face-centered-cubic (fcc) γ-brass phase (superstructure of the bcc phase), monoclinic λ′-phase (related to the λ-phase) and two orthorhombic phases (1/1/; 1/1) and (1/0; 2/1) approximants of the decagonal phase). In this study, we point out the occurrence of twin defects of the λ–Al13(Cr,Fe)4 phase. Films prepared directly in the crystalline state comprise the O1 approximant. Electron energy loss spectroscopy measurements show that all films are not oxidized except for the presence of a native oxide layer that forms in ambient atmosphere with a thickness that cannot exceed 0.3 nm. Optical properties were investigated and show that films need to be large enough (>30 nm) to reproduce the properties of bulk alloys. Finally, contact angle wetting measurements reveal that the presence of such films on a substrate, even at very low thickness, considerably decreases the wetting behavior by water.

Schenk, Sebastian, Stefan Förster, Klaus Meinel, René Hammer, Bettina Leibundgut, Maximilian Paleschke, Jonas Pantzer, Christoph Dresler, Florian O. Schumann e Wolf Widdra. "Observation of a dodecagonal oxide quasicrystal and its complex approximant in the SrTiO3-Pt(1 1 1) system". Journal of Physics: Condensed Matter 29, n. 13 (23 febbraio 2017): 134002. http://dx.doi.org/10.1088/1361-648x/aa5bdb.

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Li, Xu, Keito Horiba, Ryoichi Sugiura, Tomoaki Yamada e Junji Yuhara. "Growth of Ba–O ultrathin films on Pt(1 1 1) followed by Ti incorporation to prepare oxide crystalline approximants and quasicrystals". Applied Surface Science 561 (settembre 2021): 150099. http://dx.doi.org/10.1016/j.apsusc.2021.150099.

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Mancinelli, Chris, Jeff S. Ko, Cynthia J. Jenks, Patricia A. Thiel, Amy R. Ross, Thomas A. Lograsso e Andrew J. Gellman. "Comparative Study of the Tribological and Oxidative Properties of AlPdMn Quasicrystals and Their Cubic Approximants". MRS Proceedings 643 (2000). http://dx.doi.org/10.1557/proc-643-k8.2.

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AbstractAn experimental comparison has been made between the properties of the surfaces of an Al70Pd21Mn9 quasicrystal and its Al48Pd42Mn10 approximant. The Al70Pd21Mn9 sample was a single grain icosahedral quasicrystal cut to expose its five-fold symmetric (000001) surface. The approximant was polycrystalline β-phase Al48Pd42Mn10, which has a CsCl-type cubic structure. Surfaces of both were prepared under ultra-high vacuum (UHV) conditions and then used for comparative measurements of their frictional properties and oxidation rates. Both materials are oxidized by reaction with O2 to form a thin film of aluminum oxide that ultimately passivates their surfaces. The interesting difference between the two is that the rate of oxidation of the approximant is significantly higher than that of the quasicrystal in spite of the fact that the bulk Al concentration of the approximant is lower than that of the quasicrystal. Friction measurements were made under UHV conditions between pairs of quasicrystals and pairs of approximants whose surfaces were either clean or oxidized to varying degrees. The friction between pairs of the approximant surfaces is significantly higher than that measured between the quasicrystal surfaces under all conditions of surface oxidation.

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Tesi sul tema "Oxide quasicrystal approximants":

Ruano, Merchán Catalina. "Synthesis and characterization of 2D complex oxide films in the SrTiO₃/Pt(111)/Al₂O₃(0001) system". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0039.

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Abstract (sommario):

La formation d’oxydes quasicristallins dodécagonaux 2D (OQC), ainsi que celle de phases approximantes associées ont été récemment rapportées dans des films minces dérivés des pérovskites BaTiO₃ ou SrTiO₃, déposés sur des monocristaux de Pt orientés (111). Ces structures 2D ajoutent de nouvelles fonctionnalités aux films ultra-minces d’oxydes ternaires supportés sur des métaux à l’approche de la limite 2D. Ici, nous utilisons une approche d’empilement de couches minces dans laquelle le monocristal est remplacé par une couche tampon de Pt(111), déposée par MBE sur un substrat d’Al₂O₃(0001). Un film ultra-mince de SrTiO₃ a ensuite été déposé par PLD. L’empilement de films est entièrement caractérisé par des techniques de diffraction (LEED, RHEED, XRD), de microscopie (STM, Nano-SAM,TEM) et de spectroscopie (XPS, AES). Nous rapportons la découverte de trois nouveaux approximants obtenus par réduction de ce système par recuit à haute température dans des conditions de vide poussé. Ces phases peuvent être décrites par trois pavages différents construits avec des éléments du pavage NGT. Un modèle atomique déterminé par DFT, en accord avec les observations expérimentales, est proposé pour chaque approximant. Cette approche en couche mince peut être utile pour explorer la formation de phases d’oxyde 2D complexes dans d’autres combinaisons métal-oxyde
The formation of 2D dodecagonal quasicrystalline oxides (OQC), as related approximant phases were recently reported in thin films derived from BaTiO₃ or SrTiO₃ perovskites deposited on (111)-oriented Pt single crystal. These 2D structures add novel functionalities to the ultra-thin films of ternary oxides supported on metals when approaching the 2D limit. Here, we use a thin film stacking approach in which the single crystal is replaced by a Pt (111) buffer layer, deposited by MBE on an Al₂O₃(0001) substrate. An ultra-thin film of SrTiO₃ was subsequently deposited by PLD. The film stacking is fully characterized by diffraction (LEED, RHEED, XRD),microscopy (STM, TEM, Nano-SAM) and spectroscopy (XPS, AES) techniques. We report the discovery of three OQC approximants obtained by reducing this system by annealing at high temperature under vacuum conditions. These phases can be described by three different tilings constructed with NGT elements. An atomic model determined by DFT, in agreement with the experimental observations, is proposed for each approximant. This thin-film approach can be useful for exploring the formation of complex 2D oxide phases in other metal-oxide combinations