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Macroscopic Orientation Domains Grown via Aerodynamic Levitation: A Path toward Single Crystals

Abstract : Powder pellets of ca. 30 mg with the mol% composition 0.61Ga2O30.39La2O3 are levitated in a gas stream and melted using a pair of CO2 lasers. The levitating melt droplets crystallize to form La2Ga3O7.5 or LaGaO3 after the lasers are turned off. The microstructure of cross sections prepared from them is analyzed using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). One of the beads containing La2Ga3O7.5 shows a fully crystallized, polycrystalline microstructure while the other broke apart during cooling and its cross section shows only a single orientation domain which is more than 7 mm 2 in area. Solid-state 71 Ga NMR spectroscopy was applied to this sample and showed that it was not a single crystal but contains 2 only about 3 orientation domains. The bead containing LaGaO3 showed dendritic growth originating from multiple nuclei. Although a single crystal was not achieved by the applied experiments so far, a detailed correlation of measured cooling curves with the observed microstructures enables to devise steps along the path towards single crystal production in future experiments.
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https://hal.archives-ouvertes.fr/hal-03335424
Contributor : Michael Pitcher Connect in order to contact the contributor
Submitted on : Monday, September 6, 2021 - 11:12:00 AM
Last modification on : Tuesday, October 19, 2021 - 10:58:04 AM

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Wolfgang Wisniewski, Michael Pitcher, Emmanuel Veron, Jintai Fan, Vincent Sarou-Kanian, et al.. Macroscopic Orientation Domains Grown via Aerodynamic Levitation: A Path toward Single Crystals. Crystal Growth & Design, American Chemical Society, 2021, 21 (6), pp.3554-3561. ⟨10.1021/acs.cgd.1c00350⟩. ⟨hal-03335424⟩

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