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- W1994082882 abstract "Abstract Polymorphism in barium gallate BaGa2O4 was studied using electron diffraction and high resolution electron microscopy. Three modifications of BaGa2O4 with structures closely related to the high-temperature α-form were observed. The phase transitions from γ-BaGa2O4 (a γ = 18.6143(2) Å = 2<formula><radical><radicand>3</radicand></radical></formula>a α, c γ = 8.6544(1) Å = c α, S.G. P63) to β-BaGa2O4 (a β = 2a α, c β = c α S.G. P63) and to the new δ-polymorph having a monoclinic structure (a δ = c α, b δ = 2a α + b α, c δ = 2b α and β ≈ 92°, S.G. P21/c) were induced by electron beam irradiation. High resolution electron microscopy (HREM) observations allow to establish the close similarity between the structures of δ-BaGa2O4 and β-SrGa2O4. The γ→β and β→δ transitions involve a rearrangement of oxygen atoms in the BaO layers together with a tilting distortion of the tetrahedral framework. The microstructure of the δ-phase is characterised by the presence of numerous translation and orientation domains. Keywords: Barium GallatePolymorphismTemPhase Transition" @default.
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- W1994082882 date "2003-07-01" @default.
- W1994082882 modified "2023-10-01" @default.
- W1994082882 title "Transmission Electron Microscopy Study of Polymorphism in Barium Gallate BaGa<sub>2</sub>O<sub>4</sub>" @default.
- W1994082882 doi "https://doi.org/10.1080/0141159021000051055" @default.
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